Wikipedia

Artificial turf

(Redirected from Artificial Turf)

Artificial turf is a surface of synthetic fibers made to look like natural grass, used in sports arenas, residential lawns and commercial applications that traditionally use grass. It is much more durable than grass and easily maintained without irrigation or trimming, although periodic cleaning is required. Stadiums that are substantially covered and/or at high latitudes often use artificial turf, as they typically lack enough sunlight for photosynthesis and substitutes for solar radiation are prohibitively expensive and energy-intensive. Disadvantages include increased risk of injury especially when used in athletic competition, as well as health and environmental concerns about the petroleum and toxic chemicals used in its manufacture.

Artificial turf with rubber crumb infill
Side view of artificial turf
Diagram of the structure of modern artificial turf
Artificial turf square mats

Artificial turf first gained substantial attention in 1966, when ChemGrass was installed in the year-old Astrodome, developed by Monsanto and rebranded as AstroTurf, now a generic trademark (registered to a new owner) for any artificial turf.

The first-generation system of shortpile fibers without infill of the 1960s has largely been replaced by two more. The second features longer fibers and sand infill and the third adds recycled crumb rubber to the sand. Compared to earlier systems, modern artificial turf more closely resembles grass in appearance and is also considered safer for athletic competition. However, it is still not widely considered to be equal to grass. Sports clubs, leagues, unions and individual athletes have frequently spoken out and campaigned against it, while local governments have enacted and enforced laws restricting and/or banning its use.

History

edit

David Chaney, who moved to Raleigh, North Carolina, in 1960 and later served as Dean of the North Carolina State University College of Textiles, headed the team of Research Triangle Park researchers who created the first notable artificial turf. That accomplishment led Sports Illustrated to declare Chaney as the man "responsible for indoor major league baseball and millions of welcome mats."

Artificial turf was first installed in 1964 on a recreation area at the Moses Brown School in Providence, Rhode Island.[1] The material came to public prominence in 1966, when AstroTurf was installed in the Astrodome in Houston, Texas.[1] The state-of-the-art indoor stadium had attempted to use natural grass during its initial season in 1965, but this failed miserably and the field conditions were grossly inadequate during the second half of the season, with the dead grass painted green. Due to a limited supply of the new artificial grass, only the infield was installed before the Houston Astros' home opener in April 1966; the outfield was installed in early summer during an extended Astros road trip and first used after the All-Star Break in July.

The use of AstroTurf and similar surfaces became widespread in the U.S. and Canada in the early 1970s, installed in both indoor and outdoor stadiums used for baseball and football. More than 11,000 artificial turf playing fields have been installed nationally.[2] More than 1,200 were installed in the U.S. in 2013 alone, according to the industry group the Synthetic Turf Council.[2]

Sports applications

edit

Baseball

edit
 
Tropicana Field with its artificial turf field.
 
An artificial-turf field at a high school in Oregon.

Artificial turf was first used in Major League Baseball in the Houston Astrodome in 1966, replacing the grass field used when the stadium opened a year earlier. Even though the grass was specifically bred for indoor use, the dome's semi-transparent Lucite ceiling panels, which had been painted white to cut down on glare that bothered the players, did not pass enough sunlight to support the grass. For most of the 1965 season, the Astros played on green-painted dirt and dead grass.

The solution was to install a new type of artificial grass on the field, ChemGrass, which became known as AstroTurf. Given its early use, the term astroturf has since been genericized as a term for any artificial turf.[3] Because the supply of AstroTurf was still low, only a limited amount was available for the first home game. There was not enough for the entire outfield, but there was enough to cover the traditional grass portion of the infield. The outfield remained painted dirt until after the All-Star Break. The team was sent on an extended road trip before the break, and on 19 July 1966, the installation of the outfield portion of AstroTurf was completed.

The Chicago White Sox became the first team to install artificial turf in an outdoor stadium, as they used it only in the infield and adjacent foul territory at Comiskey Park from 1969 through 1975.[4] Artificial turf was later installed in other new multi-purpose stadiums such as Pittsburgh's Three Rivers Stadium, Philadelphia's Veterans Stadium, and Cincinnati's Riverfront Stadium. Early AstroTurf baseball fields used the traditional all-dirt path, but starting in 1970 with Cincinnati's Riverfront Stadium,[5] teams began using the "base cutout" layout on the diamond, with the only dirt being on the pitcher's mound, batter's circle, and in a five-sided diamond-shaped "sliding box" around each base. With this layout, a painted arc would indicate where the edge of the outfield grass would normally be, to assist fielders in positioning themselves properly. The last stadium in MLB to use this configuration was Rogers Centre in Toronto, when they switched to an all-dirt infield (but keeping the artificial turf) for the 2016 season.[6][7]

 
Artificial turf being installed on a baseball field in Queens, New York City.

The biggest difference in play on artificial turf was that the ball bounced higher than on real grass and also traveled faster, causing infielders to play farther back than they would normally so that they would have sufficient time to react. The ball also had a truer bounce than on grass so that on long throws fielders could deliberately bounce the ball in front of the player they were throwing to, with the certainty that it would travel in a straight line and not be deflected to the right or left. The biggest impact on the game of "turf", as it came to be called, was on the bodies of the players. The artificial surface, which was generally placed over a concrete base, had much less give to it than a traditional dirt and grass field did, which caused more wear-and-tear on knees, ankles, feet, and the lower back, possibly even shortening the careers of those players who played a significant portion of their games on artificial surfaces. Players also complained that the turf was much hotter than grass, sometimes causing the metal spikes to burn their feet or plastic ones to melt. These factors eventually provoked a number of stadiums, such as the Kansas City Royals' Kauffman Stadium, to switch from artificial turf back to natural grass.

In 2000, St. Petersburg's Tropicana Field became the first MLB field to use a third-generation artificial surface, FieldTurf. All other remaining artificial turf stadiums were either converted to third-generation surfaces or were replaced entirely by new natural grass stadiums. In a span of 13 years, between 1992 and 2005, the National League went from having half of its teams using artificial turf to all of them playing on natural grass. With the replacement of Minneapolis's Hubert H. Humphrey Metrodome by Target Field in 2010, only two MLB stadiums used artificial turf from 2010 through 2018: Tropicana Field and Toronto's Rogers Centre. This number grew to three when the Arizona Diamondbacks switched Chase Field to artificial turf for the 2019 season; the stadium had grass from its opening in 1998 until 2018, but the difficulty of maintaining the grass in the stadium, which has a retractable roof and is located in a desert city, was cited as the reason for the switch.[8] In 2020, Miami's Marlins Park (now loanDepot Park) also switched to artificial turf for similar reasons, while the Texas Rangers' new Globe Life Field was opened with an artificial surface, as it is also a retractable roof ballpark in a hot weather city; this puts the number of teams using synthetic turf in MLB at five as of 2023.

American football

edit

The first professional American football team to play on artificial turf was the Houston Oilers, then part of the American Football League, who moved into the Astrodome in 1968, which had installed AstroTurf two years prior. In 1969, the University of Pennsylvania's Franklin Field in Philadelphia, at the time also home field of the Philadelphia Eagles, switched from grass to AstroTurf, making it the first National Football League stadium to use artificial turf.

In 2002, CenturyLink Field, originally planned to have a natural grass field, was instead surfaced with FieldTurf upon positive reaction from the Seattle Seahawks when they played on the surface at their temporary home of Husky Stadium during the 2000 and 2001 seasons. This would be the first of a leaguewide trend taking place over the next several seasons that would not only result in teams already using artificial surfaces for their fields switching to the new FieldTurf or other similar surfaces but would also see several teams playing on grass adopt a new surface. (The Indianapolis Colts' RCA Dome and the St. Louis Rams' Edward Jones Dome were the last two stadiums in the NFL to replace their first-generation AstroTurf surfaces for next-generation ones after the 2004 season). For example, after a three-year experiment with a natural surface, Giants Stadium went to FieldTurf for 2003, while M&T Bank Stadium added its own artificial surface the same year (it has since been removed and replaced with a natural surface, which the stadium had before installing the turf). Later examples include Paul Brown Stadium (now Paycor Stadium), which went from grass to turf in 2004; Gillette Stadium, which made the switch in 2006;[9] and NRG Stadium, which did so in 2015. As of 2021, 14 NFL fields out of 30 are artificial. NFL players overwhelmingly prefer natural grass over synthetic surfaces, according to a league survey conducted in 2010. When asked, "Which surface do you think is more likely to shorten your career?", 90% responded artificial turf.[10] When players were asked "Is the Turf versus Grass debate overblown or a real concern"[11] in an anonymous player survey, 83% believe it is a real concern while 12.3% believe it is overblown.

Following receiver Odell Beckham Jr.'s injury during Super Bowl LVI, other NFL players started calling for turf to be banned since the site of the game, SoFi Stadium, was a turf field.[12]

Arena football is played indoors on the older short-pile artificial turf.

Canadian football

edit

The first professional Canadian football stadium to use artificial turf was Empire Stadium in Vancouver, British Columbia, then home of the Canadian Football League's BC Lions, which installed 3M TartanTurf in 1970. Today, eight of the nine stadiums in the CFL currently use artificial turf, largely because of the harsh weather conditions in the latter-half of the season. The only one that does not is BMO Field in Toronto, which initially had an artificial pitch and has been shared by the CFL's Toronto Argonauts since 2016 (part of the endzones at that stadium are covered with artificial turf).[13] The first stadium to use the next-generation surface was Ottawa's Frank Clair Stadium (now TD Place Stadium), which the Ottawa Renegades used when they began play in 2002. The Saskatchewan Roughriders' Taylor Field was the only major professional sports venue in North America to use a second-generation artificial playing surface, Omniturf, which was used from 1988 to 2000, followed by AstroTurf from 2000 to 2007 and FieldTurf from 2007 to its 2016 closure.[14]

Cricket

edit

Some cricket pitches are made of synthetic grass[15] or of a hybrid of mostly natural and some artificial grass, with these "hybrid pitches" having been implemented across several parts of the United Kingdom[16] and Australia.[17] The first synthetic turf cricket field in the USA was opened in Fremont, California in 2016.[18]

Field hockey

edit
Further information: Field hockey history § The synthetic revolution

The introduction of synthetic surfaces has significantly changed the sport of field hockey. Since being introduced in the 1970s, competitions in western countries are now mostly played on artificial surfaces. This has increased the speed of the game considerably and changed the shape of hockey sticks to allow for different techniques, such as reverse stick trapping and hitting.

Field hockey artificial turf differs from artificial turf for other sports, in that it does not try to reproduce a grass feel, being made of shorter fibers. This allows the improvement in speed brought by earlier artificial turfs to be retained. This development is problematic for areas which cannot afford to build an extra artificial field for hockey alone. The International Hockey Federation and manufacturers are driving research in order to produce new fields that will be suitable for a variety of sports.

The use of artificial turf in conjunction with changes in the game's rules (e.g., the removal of offside, introduction of rolling substitutes and the self-pass, and to the interpretation of obstruction) have contributed significantly to change the nature of the game, greatly increasing the speed and intensity of play as well as placing far greater demands on the conditioning of the players.

Association football

edit
 
Aspmyra, Norway: home of the football club FK Bodø/Glimt
 
A slide tackle driving up crumbed rubber in the playing surface

Some association football clubs in Europe installed synthetic surfaces in the 1980s, which were called "plastic pitches" (often derisively) in countries such as England. There, four professional club venues had adopted them; QPR's Loftus Road (1981–1988), Luton Town's Kenilworth Road (1985–1991), Oldham Athletic's Boundary Park (1986–1991) and Preston North End's Deepdale (1986–1994). QPR had been the first team to install an artificial pitch at their stadium in 1981, but were the first to remove it when they did so in 1988. Artificial pitches were banned from top-flight (then First Division) football in 1991, forcing Oldham Athletic to remove their artificial pitch after their promotion to the First Division in 1991, while then top-flight Luton Town also removed their artificial pitch at the same time. The last Football League team to have an artificial pitch in England was Preston North End, who removed their pitch in 1994 after eight years in use. Artificial pitches were banned from the top four divisions from 1995.

Artificial turf gained a bad reputation[neutrality is disputed] globally, with fans and especially with players. The first-generation artificial turf surfaces were carpet-like in their look and feel, and thus, a far harder surface than grass and soon became known[by whom?] as an unforgiving playing surface that was prone to cause more injuries, and in particular, more serious joint injuries, than would comparatively be suffered on a grass surface. This turf was also regarded as aesthetically unappealing to many fans[weasel words].

In 1981, London football club Queens Park Rangers dug up its grass pitch and installed an artificial one. Others followed, and by the mid-1980s there were four artificial surfaces in operation in the English league. They soon became a national joke: the ball pinged round like it was made of rubber, the players kept losing their footing, and anyone who fell over risked carpet burns. Unsurprisingly, fans complained that the football was awful to watch and, one by one, the clubs returned to natural grass.[19]

In the 1990s, many North American soccer clubs also removed their artificial surfaces and re-installed grass, while others moved to new stadiums with state-of-the-art grass surfaces that were designed to withstand cold temperatures where the climate demanded it. The use of artificial turf was later banned by FIFA, UEFA and by many domestic football associations, though, in recent years,[when?] both governing bodies have expressed resurrected interest in the use of artificial surfaces in competition, provided that they are FIFA Recommended. UEFA has now been heavily involved in programs to test artificial turf, with tests made in several grounds meeting with FIFA approval. A team of UEFA, FIFA and German company Polytan conducted tests in the Stadion Salzburg Wals-Siezenheim in Salzburg, Austria which had matches played on it in UEFA Euro 2008. It is the second FIFA 2 Star approved artificial turf in a European domestic top flight, after Dutch club Heracles Almelo received the FIFA certificate in August 2005.[20] The tests were approved.[21]

FIFA originally launched its FIFA Quality Concept in February 2001. UEFA announced that starting from the 2005–06 season, approved artificial surfaces were to be permitted in their competitions.

A full international fixture for the 2008 European Championships was played on 17 October 2007 between England and Russia on an artificial surface, which was installed to counteract adverse weather conditions, at the Luzhniki Stadium in Moscow.[22][23] It was one of the first full international games to be played on such a surface approved by FIFA and UEFA. The latter ordered the 2008 European Champions League final hosted in the same stadium in May 2008 to place on grass, so a temporary natural grass field was installed just for the final.

UEFA stressed that artificial turf should only be considered an option where climatic conditions necessitate.[24] One Desso "hybrid grass" product incorporates both natural grass and artificial elements.[25]

In June 2009, following a match played at Estadio Ricardo Saprissa in Costa Rica, American national team manager Bob Bradley called on FIFA to "have some courage" and ban artificial surfaces.

FIFA designated a star system for artificial turf fields that have undergone a series of tests that examine quality and performance based on a two star system.[26] Recommended two-star fields may be used for FIFA Final Round Competitions as well as for UEFA Europa League and Champions League matches.[27] There are currently 130 FIFA Recommended 2-Star installations in the world.[28]

In 2009, FIFA launched the Preferred Producer Initiative to improve the quality of artificial football turf at each stage of the life cycle (manufacturing, installation and maintenance).[29] Currently, there are five manufacturers that were selected by FIFA: Act Global, Limonta, Desso, GreenFields, and Edel Grass. These firms have made quality guarantees directly to FIFA and have agreed to increased research and development.

In 2010, Estadio Omnilife with an artificial turf opened in Guadalajara to be the new home of Chivas, one of the most popular teams in Mexico. The owner of Chivas, Jorge Vergara, defended the reasoning behind using artificial turf because the stadium was designed to be "environment friendly and as such, having grass would result [in] using too much water."[30] Some players criticized the field, saying its harder surface caused many injuries. When Johan Cruyff became the adviser of the team, he recommended the switch to natural grass, which the team did in 2012.[31]

In November 2011, it was reported that a number of English football clubs were interested in using artificial pitches again on economic grounds.[32] As of January 2020, artificial pitches are not permitted in the Premier League or Football League but are permitted in the National League and lower divisions. Bromley are an example of an English football club who currently use a third-generation artificial pitch.[33] In 2018, Sutton United were close to achieving promotion to the Football League and the debate in England about artificial pitches resurfaced again. It was reported that, if Sutton won promotion, they would subsequently be demoted two leagues if they refused to replace their pitch with natural grass.[34] After Harrogate Town's promotion to the Football League in 2020, the club was obliged to install a natural grass pitch at Wetherby Road;[35] and after winning promotion in 2021 Sutton Utd were also obliged to tear up their artificial pitch and replace it with grass, at a cost of more than £500,000.[36] Artificial pitches are permitted in all rounds of the FA Cup competition.

The 2015 FIFA Women's World Cup took place entirely on artificial surfaces, as the event was played in Canada, where almost all of the country's stadiums use artificial turf due to climate issues. This plan garnered criticism from players and fans, some believing the artificial surfaces make players more susceptible to injuries. Over fifty of the female athletes protested against the use of artificial turf on the basis of gender discrimination.[37][38] Australia winger Caitlin Foord said that after playing 90 minutes there was no difference to her post-match recovery – a view shared by the rest of the squad. The squad spent much time preparing on the surface and had no problems with its use in Winnipeg. "We've been training on [artificial] turf pretty much all year so I think we're kind of used to it in that way ... I think grass or turf you can still pull up sore after a game so it's definitely about getting the recovery in and getting it right", Foord said.[39] A lawsuit was filed on 1 October 2014 in an Ontario tribunal court by a group of women's international soccer players against FIFA and the Canadian Soccer Association and specifically points out that in 1994 FIFA spent $2 million to plant natural grass over artificial turf in New Jersey and Detroit.[40] Various celebrities showed their support for the women soccer players in defense of their lawsuit, including actor Tom Hanks, NBA player Kobe Bryant and U.S. men's soccer team keeper Tim Howard. Even with the possibility of boycotts, FIFA's head of women's competitions, Tatjana Haenni, made it clear that "we play on artificial turf and there's no Plan B."[41][42]

The first stadium to use artificial turf in Brazil was Atlético Paranaense's Arena da Baixada in 2016. In 2020, the administration of Allianz Parque, home of Sociedade Esportiva Palmeiras, started the implementation of the second artificial pitch in the country.[43]

Rugby union

edit

Rugby union also uses artificial surfaces at a professional level. Infill fields are used by English Premiership Rugby teams Gloucester, Newcastle Falcons, Saracens F.C. and the now defunct Worcester Warriors, as well as United Rugby Championship teams Cardiff, Edinburgh and Glasgow Warriors. Some fields, including Twickenham Stadium, have incorporated a hybrid field, with grass and synthetic fibers used on the surface. This allows for the field to be much more hard wearing, making it less susceptible to weather conditions and frequent use.

Tennis

edit
Main article: Tennis court

Carpet has been used as a surface for indoor tennis courts for decades, though the first carpets used were more similar to home carpets than a synthetic grass. After the introduction of AstroTurf, it came to be used for tennis courts, both indoor and outdoor, though only a small minority of courts use the surface.[44][45] Both infill and non-infill versions are used, and are typically considered medium-fast to fast surfaces under the International Tennis Federation's classification scheme.[44] A distinct form found in tennis is an "artificial clay" surface,[44] which seeks to simulate a clay court by using a very short pile carpet with an infill of the same loose aggregate used for clay courts that rises above the carpet fibers.[44]

Tennis courts such as Wimbledon are considering using an artificial hybrid grass to replace their natural lawn courts. Such systems incorporate synthetic fibers into natural grass to create a more durable surface on which to play.[46] Such hybrid surfaces are currently used for some association football stadiums, including Wembley Stadium.

Golf

edit

Synthetic turf can also be used in the golf industry, such as on driving ranges, putting greens and even in some circumstances tee boxes. For low budget courses, particularly those catering to casual golfers, synthetic putting greens offer the advantage of being a relatively cheap alternative to installing and maintaining grass greens, but are much more similar to real grass in appearance and feel compared to sand greens which are the traditional alternative surface. Because of the vast areas of golf courses and the damage from clubs during shots, it is not feasible to surface fairways with artificial turf.

Motor racing

edit

Artificial grass is used to line the perimeter of some sections of some motor circuits, and offers less grip than some other surfaces.[47] It can pose an obstacle to drivers if it gets caught on their car.[48]

Other applications

edit

Landscaping

edit
 
A home's yard with artificial grass.

Since the early 1990s, the use of synthetic grass in the more arid western states of the United States has moved beyond athletic fields to residential and commercial landscaping.[49] New water saving programs, as of 2019, which grant rebates for turf removal, do not accept artificial turf as replacement and require a minimum of plants.[50][51]

The use of artificial grass for convenience sometimes faces opposition: Legislation frequently seeks to preserve natural gardens and fully water permeable surfaces, therefore restricting the use of hardscape and plantless areas, including artificial turf. In several locations in different countries, homeowners have been fined, ordered to remove artificial turf and/or had to defend themselves in courts. Many of these restrictions can be found in local bylaws and ordinances. These not always applied in a consistent manner,[52][53][54] especially in municipalities that utilize a complaint-based model for enforcing local laws.

Sunlight reflections from nearby windows can cause artificial turf to melt. This can be avoided by adding perforated vinyl privacy window film adhesive to the outside of the window causing the reflection.

Airports

edit

Artificial turf has been used at airports.[55] Here it provides several advantages over natural turf – it does not support wildlife, it has high visual contrast with runways in all seasons, it reduces foreign object damage (FOD) since the surface has no rocks or clumps, and it drains well.[56]

Some artificial turf systems allow for the integration of fiber-optic fibers into the turf. This would allow for runway lighting to be embedded in artificial landing surfaces for aircraft (or lighting or advertisements to be directly embedded in a playing surface).[57]

Tanks for octopuses

edit

Artificial turf is commonly used for tanks containing octopusses, in particular the Giant Pacific octopus since it is a reliable way to prevent the octopusses from escaping their tank, as they prevent the suction cups on the tentacles from getting a tight seal.[58]

Environmental and safety concerns

edit

Environmental footprint

edit

The first major academic review of the environmental and health risks and benefits of artificial turf was published in 2014;[59] it was followed by extensive research on possible risks to human health, but holistic analyses of the environmental footprint of artificial turf compared with natural turf only began to emerge in the 2020s,[60][61] and frameworks to support informed policymaking were still lacking.[62][63] Evaluating the relative environmental footprints of natural and artificial turf is complex, with outcomes depending on a wide range of factors, including (to give the example of a sports field):[59]

  • what ecosystem services are lost by converting a site to a sports pitch
  • how resource-intensive is the landscaping work and transport of materials to create a pitch
  • whether input materials are recycled and whether these are recycled again at the end of the pitch's life
  • how resource-intensive and damaging maintenance is (whether through water, fertiliser, weed-killer, reapplication of rubber crumb, snow-clearing, etc.)
  • how intensively the facility is used, for how long, and whether surface type can reduce the overall number of pitches required

Artificial turf has been shown to contribute to global warming by absorbing significantly more radiation than living turf and, to a lesser extent, by displacing living plants that could sequester carbon dioxide through photosynthesis;[64] a study at New Mexico State University found that in that environment, water-cooling of artificial turf can demand as much water as natural turf.[65] However, a 2022 study that used real-world data to model a ten-year-life-cycle environmental footprint for a new natural-turf soccer field compared with an artificial-turf field found that the natural-turf field contributed twice as much to global warming as the artificial one (largely due to a more resource-intensive construction phase), while finding that the artificial turf would likely cause more pollution of other kinds. It promoted improvements to usual practice such as the substitution of cork for rubber in artificial pitches and more drought-resistant grasses and electric mowing in natural ones.[60] In 2021, a Zurich University of Applied Sciences study for the city of Zurich, using local data on extant pitches, found that, per hour of use, natural turf had the lowest environmental footprint, followed by artificial turf with no infill, and then artificial turf using an infill (e.g. granulated rubber). However, because it could tolerate more hours of use, unfilled artificial turf often had the lowest environmental footprint in practice, by reducing the total number of pitches required. The study recommended optimising the use of existing pitches before building new ones, and choosing the best surface for the likely intensity of use.[61] Another suggestion is the introduction of green roofs to offset the conversion of grassland to artificial turf.[66]

Maintenance

edit

Contrary to popular belief, artificial turf is not maintenance free. It requires regular maintenance, such as raking and patching, to keep it functional and safe.[67]

Pollution and associated health risks

edit
Further information: Artificial turf–cancer hypothesis

Some artificial turf uses infill such as silicon sand, but most uses granulated rubber, referred to as "crumb rubber". Granulated rubber can be made from recycled car tires and may carry heavy metals, PFAS chemicals, and other chemicals of environmental concern. The synthetic fibers of artificial turf are also subject to degradation. Thus chemicals from artificial turfs leach into the environment, and artificial turf is a source of microplastics pollution and rubber pollution in air, fresh-water, sea and soil environments.[68][69][70][71][72][73][59][excessive citations] In Norway, Sweden, and at least some other places, the rubber granulate from artificial turf infill constitutes the second largest source of microplastics in the environment after the tire and road wear particles that make up a large portion of the fine road debris.[74][75][76] As early as 2007, Environment and Human Health, Inc., a lobby-group, proposed a moratorium on the use of ground-up rubber tires in fields and playgrounds based on health concerns;[77] in September 2022, the European Commission made a draft proposal to restrict the use of microplastic granules as infill in sports fields.[78]

What is less clear is how likely this pollution is in practice to harm humans or other organisms and whether these environmental costs outweigh the benefits of artificial turf, with many scientific papers and government agencies (such as the United States Environmental Protection Agency) calling for more research.[2] A 2018 study published in Water, Air, & Soil Pollution analyzed the chemicals found in samples of tire crumbs, some used to install school athletic fields, and identified 92 chemicals only about half of which had ever been studied for their health effects and some of which are known to be carcinogenic or irritants. It stated "caution would argue against use of these materials where human exposure is likely, and this is especially true for playgrounds and athletic playing fields where young people may be affected".[79] Conversely, a 2017 study in Sports Medicine argued that "regular physical activity during adolescence and early adulthood helps prevent cancer later in life. Restricting the use or availability of all-weather year-round synthetic fields and thereby potentially reducing exercise could, in the long run, actually increase cancer incidence, as well as cardiovascular disease and other chronic illnesses."[80]

The possibility that carcinogenic substances in artificial turf could increase risks of human cancer (the artificial turf–cancer hypothesis) gained a particularly high profile in the first decades of the twenty-first century and attracted extensive study, with scientific reports around 2020 finding cancer-risks in modern artificial turf negligible.[81][82][83][84] But concerns have extended to other human-health risks, such as endocrine disruption that might affect early puberty, obesity, and children's attention spans.[85][86][87][88] Potential harm to fish[70] and earthworm[89] populations has also been shown.

A study for the New Jersey Department of Environmental Protection analyzed lead and other metals in dust kicked into the air by physical activity on five artificial turf fields. The results suggest that even low levels of activity on the field can cause particulate matter containing these chemicals to get into the air where it can be inhaled and be harmful. The authors state that since no level of lead exposure is considered safe for children, "only a comprehensive mandated testing of fields can provide assurance that no health hazard on these fields exists from lead or other metals used in their construction and maintenance."[90]

Kinesiological health risks

edit

A number of health and safety concerns have been raised about artificial turf.[2] Friction between skin and older generations of artificial turf can cause abrasions and/or burns to a much greater extent than natural grass.[91] Artificial turf tends to retain heat from the sun and can be much hotter than natural grass with prolonged exposure to the sun.[92]

There is some evidence that periodic disinfection of artificial turf is required as pathogens are not broken down by natural processes in the same manner as natural grass. Despite this, a 2006 study suggests certain microbial life is less active in artificial turf.[91]

There is evidence showing higher rates of player injury on artificial turf. By November 1971, the injury toll on first-generation artificial turf had reached a threshold that resulted in congressional hearings by the House subcommittee on commerce and finance.[93][94][95] In a study performed by the National Football League Injury and Safety Panel, published in the October 2012 issue of the American Journal of Sports Medicine, Elliott B. Hershman et al. reviewed injury data from NFL games played between 2000 and 2009, finding that "the injury rate of knee sprains as a whole was 22% higher on FieldTurf than on natural grass. While MCL sprains did not occur at a rate significantly higher than on grass, rates of ACL sprains were 67% higher on FieldTurf."[96] Metatarsophalangeal joint sprain, known as "turf toe" when the big toe is involved, is named from the injury being associated with playing sports on rigid surfaces such as artificial turf and is a fairly common injury among professional American football players. Artificial turf is a harder surface than grass and does not have much "give" when forces are placed on it.[97]

See also

edit

References

edit
  1. ^ a b Dave Brady, "It's All So Artificial: The Uncommon Ground", Petersen's 12th Pro Football Annual, 1972. Los Angeles: Petersen Publishing Co., 1972; pp. 62–65.
  2. ^ a b c d Weeks, Jennifer (2015). "Turf Wars". Distillations Magazine. 1 (3): 34–37. Archived from the original on 21 March 2018. Retrieved 22 March 2018.
  3. ^ "Definition of Astroturf – Dictionary.com". dictionary.com. Archived from the original on 18 April 2023. Retrieved 7 May 2023. This sense of the word has come to be frequently used as a generic term for any artificial turf (in the same way that other brand names have been genericized, such as xerox). When used this way, it's often seen in lowercase (astroturf).
  4. ^ "Chicago Tribune – Historical Newspapers". Archives.chicagotribune.com. Archived from the original on 5 November 2016. Retrieved 1 August 2018.
  5. ^ Moore, Jack (2 July 2015). "Throwback Thursday: Cincinnati's Riverfront Stadium and the Era of Multipurpose Mistakes". vice.com. Vice. Retrieved 13 April 2023. It was the first stadium to include dirt sliding pits around each base, something that has become standard in every turf baseball field built since.
  6. ^ "Blue Jays adding dirt infield at Rogers Centre". MLB.com. 10 February 2016. Archived from the original on 7 November 2017. Retrieved 1 August 2018.
  7. ^ "Blue Jays begin work on all-dirt infield at Rogers Centre". Toronto Star. 11 February 2016.
  8. ^ "Arizona Diamondbacks installing synthetic grass at Chase Field". azcentral.com. 12 October 2018. Retrieved 13 October 2018.
  9. ^ "Pats sign Testaverde; Gillette Stadium's grass field replaced with Field Turf". 14 November 2006. Archived from the original on 19 April 2012. Retrieved 1 August 2018.
  10. ^ "Archived copy". Archived from the original on 11 January 2015. Retrieved 15 May 2015.{{cite web}}: CS1 maint: archived copy as title (link)
  11. ^ Staff, The Athletic NFL. "Anonymous NFL player poll 2023: Best player? Biggest trash talker? Most annoying fans?". The New York Times. Retrieved 11 December 2023.
  12. ^ "Odell Beckham Jr.'s injury in Super Bowl prompts NFL players to speak out against turf fields". sportingnews.com. 14 February 2022. Retrieved 16 February 2022.
  13. ^ "BMO Field: New renovations accommodate TFC, Argos – CBC Sports". Cbc.ca. Archived from the original on 31 January 2017. Retrieved 1 August 2018.
  14. ^ "History". Saskatchewan Roughriders. 12 June 2002. Retrieved 10 January 2021. In 1988, the Roughriders replaced the first artificial turf with a new type of system called OmniTurf. Unlike AstroTurf, OmniTurf was an inlay turf system, which relied on 300 tons of sand to hold it in place (rather than the traditional glued-down system). Over the years, a number of problems occurred with this system and it eventually became necessary to replace it prior to its usable age being reached.
  15. ^ "Artificial (pitch) intelligence – all you need to know". Cricket World. 12 June 2015. Retrieved 27 November 2020.
  16. ^ Nolan, Grace (4 April 2019). "SIS Pitches uses hybrid grass technology to transform cricket". British Plastics and Rubber. Retrieved 27 November 2020.
  17. ^ "Stitched pitch – SACA adds hybrid wickets". Cricket SA. Retrieved 27 November 2020.
  18. ^ "Fremont: First official, fully lighted cricket field opens Aug. 21". The Mercury News. 11 August 2016. Retrieved 27 November 2020.
  19. ^ Lawton, Graham (4 June 2005). "Field battle over artificial grass". New Scientist (2502): 35. Archived from the original on 17 February 2006. Retrieved 11 January 2008.
  20. ^ Salzburg turf approval. UEFA.com (12 January 2006)
  21. ^ Mark Chaplin (10 November 2004) Approval for artificial fields. UEFA.com
  22. ^ "England to play on synthetic turf". BBC News. 11 July 2007. Archived from the original on 8 October 2007. Retrieved 11 January 2008.
  23. ^ "Field 'No Excuse' For England". Sporting Life UK. Archived from the original on 5 June 2011. Retrieved 11 January 2008.
  24. ^ Martyn Ziegler (10 October 2007). "England could slip up on plastic field, warns Ferguson". The Independent. London. Archived from the original on 12 January 2008. Retrieved 11 January 2008.
  25. ^ "Desso GrassMaster hybrid grass > reinforced natural grass | Desso Sports Systems". Dessosports.com. Archived from the original on 10 December 2015. Retrieved 24 December 2015.
  26. ^ "FIFA Quality Concept – Handbook of Test Methods for Football Turf" (PDF). FIFA. Archived from the original (PDF) on 3 April 2018. Retrieved 20 July 2017.
  27. ^ "Football Turf". FIFA. Archived from the original on 28 February 2008.
  28. ^ "Football Fields". FIFA. Archived from the original on 28 February 2008.
  29. ^ [1] Archived 4 December 2011 at the Wayback Machine
  30. ^ "Chivas quitará el pasto sintético que costó 1 mdd – construccion". Obrasweb.mx. Archived from the original on 1 August 2018. Retrieved 1 August 2018.
  31. ^ "El Estadio Omnilife, listo con pasto natural". Mediotiempo.com. 19 July 2012. Archived from the original on 8 July 2018. Retrieved 1 August 2018.
  32. ^ "Clubs want artificial turf return". BBC News. 18 November 2011.
  33. ^ "Artificial 3G Pitches: Coming to a ground near you?". Football Ground Guide. 26 April 2016. Archived from the original on 31 October 2016. Retrieved 30 October 2016.
  34. ^ "Plastic liberals vs conservative stick-in-the-muds: The debate around artificial pitches which isn't going away". The Independent. London. 28 February 2018. Retrieved 25 January 2020.
  35. ^ "National League promotion final: Harrogate Town beat Notts County 3-1 to secure place in League 2". BBC Sport. 2 August 2020. Retrieved 2 August 2020.
  36. ^ "Sutton United: Replacing pitch will cost promoted club over £500,000". BBC Sport. 2 June 2021. Retrieved 7 July 2021.
  37. ^ "USWNT stars not backing down on artificial playing surface stance". Fox Sports. Archived from the original on 20 October 2014. Retrieved 9 October 2014.
  38. ^ "elite female players sue". ESPN. 26 September 2014. Archived from the original on 3 October 2014. Retrieved 9 October 2014.
  39. ^ Dominic Bossi (10 June 2015). "Matildas stay out of turf war at women's World Cup". The Sydney Morning Herald. Archived from the original on 9 January 2016. Retrieved 24 December 2015.
  40. ^ "Equalizer Soccer – Players officially file lawsuit against FIFA, CSA over artificial turf at 2015 Women's World Cup". Womens.soccerly.com. Archived from the original on 5 October 2014. Retrieved 9 October 2014.
  41. ^ "Players file lawsuit in Canada over artificial Women's World Cup turf". Global News. 1 October 2014. Archived from the original on 8 October 2014. Retrieved 9 October 2014.
  42. ^ "FIFA officials to inspect BC Place turf in light of controversy". Global News. 7 October 2014. Archived from the original on 8 October 2014. Retrieved 9 October 2014.
  43. ^ "Palmeiras begin installing synthetic pitch at Allianz Parque". Xinhua News Agency. Archived from the original on 14 January 2020. Retrieved 25 January 2020.
  44. ^ a b c d "ITF surface descriptions". Itftennis.com. Archived from the original on 13 June 2018. Retrieved 1 August 2018.
  45. ^ "Tennis". Dow.com. 3 August 2001. Archived from the original on 15 December 2015. Retrieved 24 December 2015.
  46. ^ "Wimbledon considering controversial plans to introduce artificial grass courts". Tennis365. Archived from the original on 31 July 2018. Retrieved 31 July 2018.
  47. ^ Benson, Andrew (11 June 2019). "Sebastian Vettel: F1's rules-for-everything culture led to Canada penalty, says GPDA boss". BBC Sport. Retrieved 11 April 2021.
  48. ^ "Korean GP: Hamilton hampered by loose astroturf". BBC Sport. 12 October 2012. Retrieved 11 April 2021.
  49. ^ Hall, Janet (11 March 2018). "Pros and Cons: Artificial Grass Versus a Live Lawn". Archived from the original on 1 May 2018. Retrieved 30 April 2018.
  50. ^ McNary, Sharon (16 September 2019). "You Can Rip Out Your SoCal Lawn For Money Again – Now Without Landscaping Abominations". LAist. Archived from the original on 13 April 2020. Retrieved 29 April 2020.
  51. ^ "Turf Replacement Program, Terms & Conditions". SoCal Water$mart. Retrieved 29 April 2020.
  52. ^ Richards, Stefanie (12 September 2019). "Council bans fake grass from city verges". INDaily Adelaide Independent News.
  53. ^ Yuen, Kelda (29 July 2019). "'It breaks my heart to do it': Toronto homeowner ordered to remove fake grass". CBC News. Retrieved 29 April 2020.
  54. ^ Gehrke, Robert (10 July 2019). "Gehrke: Salt Lake City should revisit its ban on artificial grass and give some leniency to property owners". The Salt Lake City Tribune.
  55. ^ "Airside Applications for Artificial Turf" (PDF). Federal Aviation Administration. 2006. Archived (PDF) from the original on 14 April 2012. Retrieved 9 November 2011.
  56. ^ "Going Green – Artificial Turf for Tortoise Troubles and More". 13 April 2017.
  57. ^ Monte Burke (27 November 2006). "Field of Screens". Forbes. Archived from the original on 15 December 2007. Retrieved 11 January 2008.
  58. ^ "Exhibit Galleries Blog". galleries.neaq.org. Retrieved 8 July 2023.
  59. ^ a b c Cheng H, Hu Y, Reinhard M (2014). "Environmental and health impacts of artificial turf: a review" (PDF). Environ Sci Technol. 48 (4): 2114–29. doi:10.1021/es4044193. PMID 24467230. The major concerns stem from the infill material that is typically derived from scrap tires. Tire rubber crumb contains a range of organic contaminants and heavy metals that can volatilize into the air and/or leach into the percolating rainwater, thereby posing a potential risk to the environment and human health.
  60. ^ a b Russo, Carlo; Cappelletti, Giulio Mario; Nicoletti, Giuseppe Martino (1 July 2022). "The product environmental footprint approach to compare the environmental performances of artificial and natural turf". Environmental Impact Assessment Review. 95: 106800. Bibcode:2022EIARv..9506800R. doi:10.1016/j.eiar.2022.106800. ISSN 0195-9255. S2CID 248644133.
  61. ^ a b René Itten, Lukas Glauser und Matthias Stucki, "Life Cycle Assessment of Artificial and Natural Turf Sports Fields – Executive Summary" (Wädenswil: ZHAW Zürcher Hochschule für Angewandte Wissenschaften, 2021); cf. "Ökobilanzierung von Rasensportfeldern: Natur-, Kunststoff- und Hybridrasen der Stadt Zürich im Vergleich" (Wädenswil: ZHAW Zürcher Hochschule für Angewandte Wissenschaften, 2020), doi:10.21256/zhaw-20774.
  62. ^ Barnes, Michael R; Watkins, Eric (30 September 2022). "'Greenness' in the Eye of the Beholder: Comparing Perceptions of Sustainability and Well-being Between Artificial and Natural Turfgrass". Cities and the Environment. 15 (1). doi:10.15365/cate.202.150102. ISSN 1932-7048. S2CID 252668065.
  63. ^ Straw, C. M.; McCullough, B. P.; Segars, C.; Daher, B.; Patterson, M. S. (1 September 2022). "Reimagining Sustainable Community Sports Fields of the Future: a Framework for Convergent Science-Stakeholder Decision-Making". Circular Economy and Sustainability. 2 (3): 1267–1277. Bibcode:2022CirES...2.1267S. doi:10.1007/s43615-021-00115-z. ISSN 2730-5988. S2CID 242002500.
  64. ^ Golden, Leslie M. (2021) "The Contribution of Artificial Turf to Global Warming," Sustainability and Climate Change, December,14 (6) 436-449; http://doi.org/10.1089/scc.2021.0038
  65. ^ Kanaan, Ahmed; Sevostianova, Elena; Leinauer, Bernd; Sevostianov, Igor (October 2020). "Water Requirements for Cooling Artificial Turf". Journal of Irrigation and Drainage Engineering. 146 (10). doi:10.1061/(ASCE)IR.1943-4774.0001506. ISSN 0733-9437. S2CID 224884193.
  66. ^ Julian E. Lozano and Shon Ferguson, "Ecosystem services for compensation of artificial turf systems" (May 2021).
  67. ^ Jastifer JR, McNitt AS, Mack CD, Kent RW, McCullough KA, Coughlin MJ, Anderson RB (2019). "Synthetic Turf: History, Design, Maintenance, and Athlete Safety". Sports Health (Review). 11 (1): 84–90. doi:10.1177/1941738118793378. PMC 6299344. PMID 30096021.
  68. ^ Lerner, Sharon (8 October 2019). "Toxic PFAS Chemicals Found in Artificial Turf". The Intercept. Retrieved 4 January 2020.
  69. ^ Celeiro, Maria; Armada, Daniel; Ratola, Nuno; Dagnac, Thierry; de Boer, Jacob; Llompart, Maria (1 May 2021). "Evaluation of chemicals of environmental concern in crumb rubber and water leachates from several types of synthetic turf football pitches". Chemosphere. 270: 128610. Bibcode:2021Chmsp.27028610C. doi:10.1016/j.chemosphere.2020.128610. hdl:1871.1/b88f1b78-db15-4e7c-9129-91bc833e35e3. ISSN 0045-6535. PMID 33121811. S2CID 226206761.
  70. ^ a b Chiba, Rihito; Fujinuma, Ryosuke; Yoshitomi, Tomoyasu; Shimizu, Yasuo; Kobayashi, Makito (24 January 2023). "Ingestion of rubber tips of artificial turf fields by goldfish". Scientific Reports. 13 (1): 1344. Bibcode:2023NatSR..13.1344C. doi:10.1038/s41598-023-28672-3. ISSN 2045-2322. PMC 9873930. PMID 36693897.
  71. ^ "Microplastic Pollution from Artificial Grass – A Field Guide". KIMO. 27 February 2017. Archived from the original on 19 April 2017. Retrieved 19 April 2017.
  72. ^ "Artificial Turf. Why it is not the answer". SELVA. Archived from the original on 3 August 2016. Retrieved 19 April 2017.
  73. ^ "Microplastics in agricultural soils: A reason to worry?". Norwegian Institute for Water Research (NIVA). 3 February 2017. Archived from the original on 19 April 2017. Retrieved 19 April 2017. Microplastics are increasingly seen as an environmental problem of global proportions. While the focus to date has been on microplastics in the ocean and their effects on marine life, microplastics in soils have largely been overlooked. Researchers are concerned about the lack of knowledge regarding potential consequences of microplastics in agricultural landscapes from application of sewage sludge.
  74. ^ Kole, Pieter Jan; Löhr, Ansje J.; Van Belleghem, Frank; Ragas, Ad; Kole, Pieter Jan; Löhr, Ansje J.; Van Belleghem, Frank G. A. J.; Ragas, Ad M. J. (20 October 2017). "Wear and Tear of Tyres: A Stealthy Source of Microplastics in the Environment". International Journal of Environmental Research and Public Health. 14 (10): 1265. doi:10.3390/ijerph14101265. PMC 5664766. PMID 29053641.
  75. ^ Bø, S M; Bohne, R A; Aas, B; Hansen, L M (1 November 2020). "Material flow analysis for Norway's artificial turfs". IOP Conference Series: Earth and Environmental Science. 588 (4): 042068. Bibcode:2020E&ES..588d2068B. doi:10.1088/1755-1315/588/4/042068. hdl:11250/2724609. ISSN 1755-1307. S2CID 229516855.
  76. ^ "Tire wear foremost source of microplastics". IVL Swedish Environmental Research Institute. 29 March 2016. Archived from the original on 19 April 2017. Retrieved 19 April 2017. researchers have ranked the sources of microplastic particles by size. The amount of microplastic particles emitted by traffic is estimated to 13 500 tonnes per year. Artificial turf ranks as the second largest source of emissions and is responsible for approximately 2300-3900 tonnes per year.
  77. ^ David R. Brown, Sc.D. (2007). "Artificial Turf" (PDF). Environment & Human Health, Inc. Archived (PDF) from the original on 10 April 2008. Retrieved 21 December 2007. {{cite journal}}: Cite journal requires |journal= (help)
  78. ^ "COMMISSION REGULATION (EU) …/… of XXX amending Annex XVII to Regulation (EC) No 1907/2006 of the European Parliament and of the Council concerning the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH) as regards synthetic polymer microparticles". The European Commission. 23 September 2022. Retrieved 16 February 2023.
  79. ^ Benoit G & Demars S (2018). "Evaluation of organic and inorganic compounds extractable by multiple methods from commercially available crumb rubber mulch". Water, Air, & Soil Pollution. 229 (3): 64. Bibcode:2018WASP..229...64B. doi:10.1007/s11270-018-3711-7. S2CID 103861679.
  80. ^ Bleyer, Archie (1 December 2017). "Synthetic Turf Fields, Crumb Rubber, and Alleged Cancer Risk". Sports Medicine. 47 (12): 2437–2441. doi:10.1007/s40279-017-0735-x. ISSN 1179-2035. PMID 28493060. S2CID 46183771.
  81. ^ "Granules and mulches on sports pitches and playgrounds – ECHA". echa.europa.eu. Retrieved 1 July 2023.
  82. ^ Perkins, AN; Inayat-Hussain, SH; Deziel, NC; et al. (2019). "Evaluation of potential carcinogenicity of organic chemicals in synthetic turf crumb rubber". Environmental Research. 169: 163–172. Bibcode:2019ER....169..163P. doi:10.1016/j.envres.2018.10.018. PMC 6396308. PMID 30458352.
  83. ^ Pronk, Marja E. J.; Woutersen, Marjolijn; Herremans, Joke M. M. (May 2020). "Synthetic turf pitches with rubber granulate infill: are there health risks for people playing sports on such pitches?". Journal of Exposure Science & Environmental Epidemiology. 30 (3): 567–584. Bibcode:2020JESEE..30..567P. doi:10.1038/s41370-018-0106-1. ISSN 1559-064X. PMC 7181390. PMID 30568187.
  84. ^ Schneider, Klaus; Bierwisch, Anne; Kaiser, Eva (20 May 2020). "ERASSTRI – European risk assessment study on synthetic turf rubber infill – Part 3: Exposure and risk characterisation". Science of the Total Environment. 718: 137721. Bibcode:2020ScTEn.71837721S. doi:10.1016/j.scitotenv.2020.137721. ISSN 0048-9697. PMID 32173010. S2CID 212729483.
  85. ^ Armada, Daniel; Llompart, Maria; Celeiro, Maria; Garcia-Castro, Pablo; Ratola, Nuno; Dagnac, Thierry; de Boer, Jacob (15 March 2022). "Global evaluation of the chemical hazard of recycled tire crumb rubber employed on worldwide synthetic turf football pitches". Science of the Total Environment. 812: 152542. Bibcode:2022ScTEn.81252542A. doi:10.1016/j.scitotenv.2021.152542. hdl:10347/27898. ISSN 0048-9697. PMID 34952075. S2CID 245432545.
  86. ^ Colon, I (2000). "Identification of phthalate esters in the serum of young Puerto Rican girls with premature breast development". Environmental Health Perspectives. 108 (9): 895–900. doi:10.1289/ehp.108-2556932. PMC 2556932. PMID 11017896.
  87. ^ Newbold, RR (2009). "Environmental estrogens and obesity". Molecular and Cellular Endocrinology. 304 (1–2): 84–89. doi:10.1016/j.mce.2009.02.024. PMC 2682588. PMID 19433252.
  88. ^ Grun, F. (2009). "Endocrine disruptors as obesogens". Molecular and Cellular Endocrinology. 304 (1–2): 19–29. doi:10.1016/j.mce.2009.02.018. PMC 2713042. PMID 19433244.
  89. ^ Pochron, Sharon T.; Fiorenza, Andrew; Sperl, Cassandra; Ledda, Brianne; Lawrence Patterson, Charles; Tucker, Clara C.; Tucker, Wade; Ho, Yuwan Lisa; Panico, Nicholas (April 2017). "The response of earthworms ( Eisenia fetida ) and soil microbes to the crumb rubber material used in artificial turf fields". Chemosphere. 173: 557–562. Bibcode:2017Chmsp.173..557P. doi:10.1016/j.chemosphere.2017.01.091. PMID 28142114.
  90. ^ Shalat SL. An evaluation of potential exposures to lead and other metals as the result of aerosolized particulate matter from artificial turf playing fields. 2011. New Jersey Department of Environmental Protection. http://www.nj.gov/dep/dsr/publications/artificial-turf-report.pdf
  91. ^ a b "New Penn State Study Debunks Staph Bacteria Scare in Synthetic Turf" (Press release). Penn State College of Agricultural Sciences. 30 August 2006. Archived from the original on 30 August 2006. Retrieved 11 January 2008.
  92. ^ C. Frank Williams, Gilbert E. Pulley (2002). "Synthetic Surface Heat Studies" (PDF). Brigham Young University. Archived (PDF) from the original on 10 April 2008. Retrieved 19 February 2008. {{cite journal}}: Cite journal requires |journal= (help)
  93. ^ "Senate (House) studies 'Mod Sod'". Spokane Daily Chronicle. (Washington). Associated Press. 2 November 1971. p. 16.
  94. ^ "Fake turf makers deny fault". Eugene Register-Guard. (Oregon). Associated Press. 3 November 1971. p. 5D.
  95. ^ Underwood, John (15 November 1971). "New Slant on the Mod Sod". Sports Illustrated. p. 32.
  96. ^ "Ask Dr. Geier – Are ACL tears more common on grass or FieldTurf? | Dr. David Geier – Sports Medicine Simplified". Dr. David Geier. 18 January 2013. Archived from the original on 9 January 2016. Retrieved 24 December 2015.
  97. ^ "Turf Toe-OrthoInfo – AAOS". Orthoinfo.aaos.org. 1 August 2012. Archived from the original on 9 December 2015. Retrieved 24 December 2015.
 
Wikimedia Commons has media related to Artificial turf.

  This article incorporates text by National Center for Health Research available under the CC BY-SA 3.0 license. The text and its release have been received by the Wikimedia Volunteer Response Team; for more information, see the talk page.

Retrieved from "https://en.wikipedia.org/w/index.php?title=Artificial_turf&oldid=1255623417"