Ultrafine particles, common traffic pollutants, linked to heart disease deaths in California, study finds.

At an EPA hearing, witnesses say the ozone standard needs to be tightened, despite businesses' opposition

Mexican government orders halt to construction of massive mall project in Cancun catering to Chinese vendors

According to the U.S. Geological Survey, the quake's epicenter was just off the coast and caused light shaking in some parts of the North Coast area, including Ferndale and Eureka.

The political clash over climate change has entered new territory that does not involve a massive oil pipeline or a subsidy for renewable energy, but a quaint federal chart that tries to nudge Amer

California puts limits on tear gas-like pesticide chloropicrin used for strawberries and other crops

A proposal to lay high-speed rail tracks through California's Angeles National Forest brought thousands of opponents to a rally Tuesday night in the eastern San Fernando Valley.

Two small magnitude 3.5 earthquakes shook parts of Texas on Tuesday, but no damage was immediately reported.

99 Cents Only Stores has agreed to pay more than $2 million to settle accusations that its operations improperly stored, handled and disposed of hazardous and pharmaceutical waste.

Safeway, Vons stores dumped medicines and batteries in landfills, prosecutors allege