When it rains those particles run off in to the streams, where they can leach chemicals out, especially as the materials degrade in uv light and oxygen with the

When it rains those particles run off in to the streams, where they can leach chemicals out, especially as the materials degrade in uv light and oxygen with their massively increased surface area as particles vs being part of a tire. And brake pad nanoparticles make up air pollution around freeways. Nanoparticles easily stay suspended and disperse, and can be resuspended.