GOOD

Is Artificial Turf Toxic?

The chemicals used to make fake grass may pose health risks to athletes

Image via Shutterstock

If you want to get a soccer mom’s attention, bring up the subject of artificial turf, the preferred playing surface for children from pre-K to college—or at least preferred by school boards and parks and recreation departments.


From concerns about concussions to cancer, parents have become alarmed by media reports of increased injuries and illnesses.

And there is the further question of who is responsible for assuring the safety of these fields—the Environmental Protection Agency, the Centers for Disease Control, the Consumer Product Safety Commission?

As an environmental health professor who has examined a variety of environmental problems and as a soccer dad who watched my son play on these fields for years, I think it’s worth examining the facts and myths about artificial turf fields and what hazards may or may not be associated with playing on them. Based on studies I have reviewed and conducted, I believe there is a potential health risk, because of the chemicals in tires, which are recycled into crumbs to support the plastic blades of synthetic grass.

Just what is it, anyway?

Artificial turf is made up of three major parts:

  1. Backing material that will serve to hold the individual blades of artificial grass
  2. The plastic blades themselves
  3. The infill, those tiny black crumbs, that helps support the blades

Various pigments are used to provide the green color of the blades. These can include lead or titanium for the white lines and other metals for school logos on the field.

Those little black crumbs are the problems. Tires can be toxic.

Modern tires are a mixture of natural and synthetic rubber, carbon black–a material made from petroleum–and somewhere between four and 10 gallons of petroleum products. They also contain metals, including cadmium, lead (which is neurotoxic), and zinc.

Some of the chemicals in tires, such as dibenzopyrenes, are known carcinogens.

In addition to the chemicals used in the manufacture of tires, any chemical the tires were exposed to during their use can be absorbed on the carbon black in the tires.

More to the problem than crumbs

Even though artificial turf does not have to be mowed, it turns out that crabgrass and other weeds can start growing in it. To keep its finely manicured appearance, weed killers need to be applied, a relatively common practice.

Unfortunately, a variety of health concerns have been linked to these products.

Also, artificial turf is often treated with biocides, as artificial has been associated with increased risk of infections from Multidrug-Resistant Staphylococcus aureus (MRSA). More commonly referred to as flesh-eating bacteria, MRSA can occur after skin is scraped or cut, which can occur from sliding on artificial turf.

Biocides, however, may have toxic effects of their own. And they may also contribute to increased resistance of bacteria and to the efficacy of these agents.

The list of drawbacks goes on … and on …

Fields with artificial turf tend to get far hotter than grass fields. Field surface temperatures can reach as high as 200 degrees Fahrenheit. At these temperatures, even with athletic shoes on, children can get burned feet. It is rare, however, even on a very hot day, that natural grass exceeds half of that temperature (100 degrees Fahrenheit).

While manufacturers recommend spraying fields with water to keep the temperature down, this improvement can vanish in as little as 20 minutes.

Because it is laid over either concrete or compacted earth, artificial turf is a harder surface than grass. This can increase the risk of injuries, particularly concussions.

The unit used to describe hardness is Gmax. While different numbers have been reported as the Gmax for artificial turf—ranging from the high 60s to over 125—it is important to keep in mind that these numbers are highly dependent on the substrate, temperature, age, and maintenance of the field. The key is that the higher the number, the higher the likelihood of concussion.

Can the tire chemicals get into kids?

The key question on exposure is: Do these chemicals get into children playing on these fields?

While it is true that the tire crumbs are large, it is easy to show that they don’t necessarily remain large over the life of the field. In a New Jersey study we employed a robot we call PIPER (Pre-toddler Inhalable Particulate Environmental Robotic) to study if there were inhalable exposures from the artificial turf.

We showed the tiny particles from the turf can become suspended in air above the field and be inhaled by children playing on the field. What has become apparent is that microscopic carbon black particles break off from the crumb rubber and are small enough to be inhalable. Additionally, the blades of grass can also break down into microscopic particles over years of exposure to sunlight and weather, forming a respirable dust.

How do these particles get into a child?

Think of the “Peanuts” comic strip character Pig Pen, the child always followed around by a visible cloud. The truth is that all children–indeed, all people–have a cloud around them of microscopic particles. This personal micro-environment of dust particles, invisible to the naked eye, is just as real as Pig Pen’s.

These small particles and their chemicals can be inhaled or swallowed by a child.

And if so, do they cause illness?

A clear answer on whether artificial turf increases the risk of injury or illness is far more challenging.

Let’s consider the two major concerns with regard to artificial turf: cancer and neurologic effects.

The question of cancer and artificial turf gained significant national attention in the United States with a series of news stories on NBC Nightly News regarding a cluster of cancers in young women soccer players.

A cancer cluster is the appearance of an unusually high rate of cancer in one location in a particular time frame. The story, while dismissed by the turf industry, again resurfaced in the fall of 2015.

Information has continued to accrue on this cancer cluster. While as many as 80 percent of suspected cancer clusters are determined not to be true increases in cancer cases and due only to random chance, the problem is that without detailed—and often expensive—scientific investigation, whether it is real or not cannot be determined.

Just recently the Washington State Department of Health issued a report on its study of the reported cancer cluster in these soccer players. Their report found no evidence of a causal effect of playing on artificial turf and cancer. As they acknowledge, that does not mean there is no risk, only that this study did not find one. They also suggested there is still room for broader investigation on this question.

What about the potential risk of neurologic impairment from ingestion or inhalation of any lead present in the turf? The lead can be present both in the blades, as a color pigment for logos and white lines, as well as in the infill crumb rubber. For more information on lead, see my earlier article for The Conversation.

What’s the bottom line on safety?

While the turf industry says it’s safe, we know that tires contain established carcinogens. If we considered only what tires are made of, we would think they should be classified as hazardous waste, though currently EPA classifies tires as municipal waste.

The EPA has been conducting research into the question of toxicity of crumb rubber, but the jury is still out.

There is little question in the mind of many scientists that crumb rubber should not be a first choice material for children to play on. Parents should be able to just enjoy watching their children playing sports and not worry that they are being put unnecessarily at risk.

Sports
via Gage Skidmore / Flickr

If you are totally ready to move on from Donald Trump, you're not alone. According to a report last April from the Wason Center National Survey of 2020 Voters, "President Trump will be the least popular president to run for reelection in the history of polling."

Yes, you read that right, "history of polling."

Keep Reading Show less
Politics
via Around the NFL / Twitter

After three years on the sidelines, Colin Kapernick will be working out for multiple NFL teams on Saturday, November 16 at the Atlanta Falcons facility.

The former 49er quarterback who inflamed the culture wars by peacefully protesting against social injustice during the national anthem made the announcement on Twitter Tuesday.

Kaepernick is scheduled for a 15-minute on-field workout and an interview that will be recorded and sent to all 32 teams. The Miami Dolphins, Dallas Cowboys, and Detroit Lions are expected to have representatives in attendance.

RELATED: Joe Namath Says Colin Kaepernick And Eric Reid Should Be Playing In The NFL

"We like our quarterback situation right now," Miami head coach, Brian Flores said. "We're going to do our due diligence."

NFL Insider Steve Wyche believes that the workout is the NFL's response to multiple teams inquiring about the 32-year-old quarterback. A league-wide workout would help to mitigate any potential political backlash that any one team may face for making an overture to the controversial figure.

Kapernick is an unrestricted free agent (UFA) so any team could have reached out to him. But it's believed that the interested teams are considering him for next season.

RELATED: Video of an Oakland train employee saving a man's life is so insane, it looks like CGI

Earlier this year, Kaepernick and Carolina Panthers safety Eric Reid reached a financial settlement with the league in a joint collusion complaint. The players alleged that the league conspired to keep them out after they began kneeling during the national anthem in 2016.

Before the 2019 season, Kaepernick posted a video of himself working out on twitter to show he was in great physical condition and ready to play.

Kaepnick took the 49ers to the Super Bowl in 2012 and the NFC Championship game in 2013.

He has the 23rd-highest career passer rating in NFL history, the second-best interception rate, and the ninth-most rushing yards per game of any quarterback ever. In 2016, his career to a sharp dive and he won only of 11 games as a starter.

Culture

In the category of "claims to fame nobody wants," the United States can now add "exporter of white supremacist ideology" to its repertoire. Super.

Russell Travers, acting director of the National Counterterrorism Center, made this claim in a briefing at The Washington Institute in Washington, D.C. "For almost two decades, the United States has pointed abroad at countries who are exporters of extreme Islamist ideology," Travers said. "We are now being seen as the exporter of white supremacist ideology. That's a reality with which we are going to have to deal."

Keep Reading Show less

Between Alexa, Siri, and Google, artificial intelligence is quickly changing us and the way we live. We no longer have to get up to turn on the lights or set the thermostat, we can find the fastest route to work with a click, and, most importantly, tag our friends in pictures. But interacting with the world isn't the only thing AI is making easier – now we can use it save the world, too.

Keep Reading Show less
Good News