Major air pollutants have declined in recent decades, but USA TODAY’s analysis shows wildfire smoke is taking their place.

AirNow is a collaborative effort of federal agencies that provides air quality data across the U.S. The site also has ...

A map from AirNow suggests that the air quality around Los Angeles and Anaheim, California, is unhealthy as the Palisades ...

Air quality across parts of California is deteriorating to hazardous levels as strong winds drive rapid wildfire spread and ...

Wildfire smoke increases tiny particles in the air known as particulate matter that can be harmful to people’s health.

According to the World Health Organization (WHO), fine particles from wildfire smoke are linked to premature death and can ...

Wildfires are tearing through thousands of acres in Los Angeles County in California, as strong Santa Ana winds stoke the ...

Fires continue to ravage Los Angeles County in California. The smoke and pollution poses a threat to certain vulnerable groups.

As fires tear through Los Angeles County, many areas are dealing with smoke in the air. On the Eastside, going outside and ...

As wildfires ravage Los Angeles, experts answer key questions about how wildfire smoke affects health and how to protect ...

Certain masks are effective in protecting against wildfire smoke — but only if they are fitted and worn properly.

Multiple wildfires are still plaguing Southern California, resulting in poor or even dangerous air quality in many areas. As ...