"There are 80, 000 chemicals in commerce, " says California Environmental Protection Agency toxicologist Stephen Dizio.

NPR: New Safety Law Doesn't Mean All's Well In Toyland

In 2008, California sued the U.S. Environmental Protection Agency for trying to block its enactment of tough new rules on tailpipe emissions.

FORBES: With Driverless Cars, Once Again It Is California Leading The Way

In January, he directed the Environmental Protection Agency to review California's request for a waiver from federal law so that it can set higher tailpipe emissions standards.

FORBES: Autos

To please environmentalists, he ordered the Environmental Protection Agency to consider letting California set its own emissions standards (ie, stricter ones) for cars.

ECONOMIST: Barack Obama's start

Data from the US Environmental Protection Agency were used to work out levels of pollution for addresses in California.

BBC: Autism: Traffic pollution linked, study suggests