Emily Guerin

More than 70 schools across Southern California that are near freeways have air filters to take out dangerous diesel particulate matter. But more are needed.

The Interior Department is considering reopening to other uses federal land that had been set aside for conservation under the Obama administration.

Brown hopes to hit that ambitious goal by building half a million electric and hydrogen fueling stations and offering $1.6 billion on vehicle rebates.

“You’re trying to measure ice crystals from an aircraft that’s flying through the clouds at a couple of hundred miles per hour,” he said. These observations could help secure Southern California's water supply.

"It makes me sick to my stomach," one worker says of the mostly automated loading dock. Automation has helped lower diesel pollution by 85 percent‚ but at a high human cost.

A week after the Department of Interior released its offshore drilling plan, governors of coastal states are asking Secretary Ryan Zinke to spare their coastline. Including Gov. Jerry Brown.

Two people died in the largest wildfire state history. The mudslides have killed far more. How come? Experts say it's a combination of perceived threat and 'disaster burnout.'

City Atty. Mike Feuer alleges the companies are illegally treating their drivers as independent contractors, not employees, to boost their bottom line.

It's been a hazy shade of winter in Southern California. Thursday is the 11th straight day that you can't burn wood in your fireplace.

Thousands of older adults are dying prematurely every year from breathing air that meets federal safety standards, but is somewhat polluted.

Scientists say it depends on two things: how much it rains, and how soon the area burns again in another wildfire.

Rich Thompson works 12-hour days to answer the question everyone wants to know: when, exactly, will the Santa Ana winds start blowing?