But air quality can vary on a hyperlocal scale, meaning the network of official sites is "fairly sparse," says Michael Jerrett, an air pollution expert at the University of California, Los Angeles.

Given morning allergy attacks and increasing environmental health concerns, it’s no wonder people are concerned about potential air quality problems in their homes. While an indoor air quality ...

Calculating air pollution from wildfires and other events has become more complicated. That doesn’t mean it’s necessarily more accurate.

Air quality, measured on a scale from good to hazardous, was good to moderate on Monday and mostly good across Los Angeles County on Tuesday, according to data from the South Coast Air Quality ...

Moderate air quality is between 51 and 100, or in the yellow band of the AQI scale. Air quality in the moderate range can still be risky for people who are unusually sensitive to air pollution.

President Joe Biden signed a federal emergency declaration. The AQI measures air quality on a scale from 0 to 500, with readings below 50 considered "Good" and above 300 classified as "Hazardous ...

and a graphic that shows where your current air quality falls on the air quality scale. The other Home Screen widget design uses the EPA’s color scheme as the background of the widget to make the air ...