Toxic pollutant from car tires reaching San Francisco Bay, scientists say

Toxic pollutant from car tires reaching San Francisco Bay, scientists say

A scientific research group here in the Bay Area is generating new evidence about another type of pollution caused not just by cars, but by their tires. It's a chemical known as 6PPD-Q, which is so toxic to some species of fish that it's believed that a single drop in a swimming pool could be fatal.