Do foam floor play mats off-gas toxic chemicals?

What's actually in it

Those colorful interlocking foam mats sold for babies and toddlers are usually made from EVA foam (ethylene-vinyl acetate). The foaming process uses a chemical called azodicarbonamide. When that breaks down, it releases formamide, a chemical that the EU classifies as a substance of concern.

Babies and toddlers are exactly at mat level. They breathe the air right above the surface, put pieces in their mouths, and press their faces into the foam. That makes their exposure much higher than an adult walking across the room.

What the research says

A 2023 study in Environ Sci Technol measured emissions from foam mats in real time. They found formamide and ammonia releasing from the surface. Formamide concentrations were detectable and consistent with levels that have raised regulatory concern in Europe.

Newer mats or those fresh from packaging had higher emissions. The chemicals dissipate over time, but the off-gassing doesn't stop completely.

The safest swap is a cotton play mat or a wool area rug. Both materials are naturally breathable and don't require chemical foaming agents. Try wool home textiles for safer floor coverage where babies play.