The air quality index measures PM2.5, less than 2.5 microns particles, to determine the intensity of air pollution in cities.

After an atmospheric river doused the North Bay Tuesday, forecasters say more rain will return to the region Thursday and Friday. Residents can also expect temperatures to drop below freezing, ...

As multiple wildfires burned in Los Angeles County, Kyle Jeong came back to his dorm to find his roommate switching between ...

At least 29 people have died in the fires across the Los Angeles area. At least two of the people killed in the Southern ...

The catastrophic fires in Los Angeles are far from extinguished ... “Corporations got us into this mess, but even they can’t escape the devastating reality of climate change.” ...

Large wildfires in the desert were once rare. Now experts worry that invasive plants and a changing fire cycle are putting ...

Fueled by powerful winds and dry conditions, a series of ferocious wildfires erupted the second week of January and roared ...

The largest fires started on January 7 and devastated swathes of L.A., including Pacific Palisades and Altadena. The fires ...

Watch Duty’s success raises questions about why citizen-led tech is outpacing government emergency response efforts. The company’s co-founder explores the lessons agencies can learn from this ...

Three weeks after the Palisades and Eaton Fires, many impacted families are starting to figure out their plans moving forward ...

All wildfires burning in Southern California were largely contained as of Thursday morning, even after a new fire ignited in ...

Fire spotters used to watch with binoculars from forest towers. Now, technology can help forecast fire behavior, but human ...