When Susanna Kamon watches her 12-year-old son on the soccer field, she often wonders whether the artificial turf poses a risk to his health.

Kamon has read the research and talked to toxicologists and feels there is not yet a definitive answer to a question many parents are asking these days: Is the crumb rubber infill made from recycled tires safe?

So while more research takes place around the country, including a new study led by the US Environmental Protection Agency, Kamon and a group of Concord residents think the town should take a step back.

“Let’s hold off on planning any new fields,’’ she said.

The group, Grass Fields for Safe Sports, put an article on this year’s Town Meeting warrant calling for a three-year moratorium on the construction or installation of artificial turf on town-owned land. Town Meeting starts at 7 p.m. on Monday, April 4, at Concord-Carlisle Regional High School.

This is the second time in two years a moratorium has come before Town Meeting. The proposal was rejected last year at a time when the town was in the planning stages for a new turf field at the high school. This time around, no new fields are in the works.

“There are no current plans but we don’t know what might come down the road in a few years,’’ said Janet Miller, a member of the group. “This would keep them from moving forward and draw people’s attention to the fact that this may not be good. There is increasing concern about artificial turf.’’

Residents and officials in other communities such as Medway and Marlborough have also raised concerns about the safety of artificial turf.

The Synthetic Turf Council, a national industry group, contends that the fields are safe and points to years of research, including more than 50 studies, that “provides confidence that there is no elevated human health or environmental risk from the ingestion, inhalation, or dermal contact with synthetic turf.’’

The group recently posted a You Tube video titled “The Truth About Artificial Turf & Crumb Rubber,’’ featuring Concord resident John Boynton.

Boynton is the president of Concord Carlisle at Play Inc., a nonprofit group that has worked for new outdoor facilities at the high school, including a new turf field.

“Would I let my kids play on these fields?’’ Boynton asked in the video. “Absolutely. All four of my kids do play on these fields. It’s a tremendous opportunity for them to get outside and be active. We are so grateful to have them. I’m convinced they are safe.’’

According to the EPA, studies have not shown an elevated health risk from playing on fields with tire crumb, but the research has not been comprehensive.

Because of the need for more information, the EPA, the Centers for Disease Control and Prevention/Agency for Toxic Substances and Disease Registry, and the US Consumer Product Safety Commission in February launched a plan to study key environmental human health questions.

According to the EPA, this Federal Research Action Plan on Recycled Tire Crumb Used on Playing Fields and Playgrounds seeks to gather more data and identify ways in which people may be exposed to tire crumb based on their activities on the fields.

By late 2016, the agencies will release a draft report that describes the findings and conclusions and outlines any additional research needs and next steps.

Kamon said the moratorium will allow for more research to take place, and she hopes that in that time, she and others can look at ways to build more grass fields.

“My hope is that we’ll be able to offer that choice to parents,’’ she said. “It is a shame for them to have to choose between offering sports to their kids and being cautious about their health.’’

According to the town’s information officer, there are three turf fields, all at the high school, and 20 grass playing fields at nine sites around Concord.

Kamon said this is the second year her son is playing soccer on artificial turf and she has had reservations.

“Short-term exposure is probably less of a risk,’’ she said. “I’m not going to keep him from playing at this point, but I’m going to work to get more grass fields in town. It’s a complex issue, yet there is plenty of reason to be cautious given the list of chemicals that are in crumb rubber that haven’t been adequately studied.’’

The Concord Select Board and the Board of Health have not taken a position on the article.

Jennifer Fenn Lefferts can be reached at jflefferts@ yahoo.com.