During the processing of tire rubber to be used as playground mulch, it's cleaned, and most of the worst contaminates are removed. The worst thing in the recycled tires isn't heavy metals it's carbon black, and in both cases it shouldn't matter unless your children are eating the tire mulch.
https://www.cnn.com/2017/01/27/health/artificial-turf-cancer...
Have you been to children playgrounds? This is exactly what they are going to do, at least once, at least try. On top of constantly touching it with they hands and then touch with everything else, falling on the ground, etc.
Calling it a toxic disaster and concentrating it in a area of play is plain insane.
In a few years we will find out why it made no sense and then they will have to tear them out.
