The Air Quality Index, or AQI, is the primary system used to warn the public when air pollution is dangerous. It’s based on ...

The Oregon Department of Environmental Quality issued an air quality advisory Wednesday for Klamath County, southern Lake ...

Several parts of southern California are currently under windblown dust and ash advisories as deadly wildfires continue to ...

The Oregon DEQ has issued an air quality advisory for parts of Oregon due to stagnant air trapping pollutants.

I've lived in Oregon for a decade, meaning I've experienced multiple wildfire seasons. You learn quickly, in these conditions ...

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

Wildfire smoke causes particularly dangerous air quality, especially for sensitive groups including children and pregnant ...

Ash from the recent LA County fires and burn scars formed by other wildfires in the fall can be dispersed by strong winds.

The average daily air quality index (AQI) was recorded at 386 (very poor) at 4 pm against Tuesday's AQI of 275 (poor).

Air quality is a big concern for everyone in Southern California, even for those who don't live near fire zones. Here are answers to some of your top questions.

NCR, authorities have imposed Stage 4 restrictions under the Graded Response Action Plan (GRAP). The air quality index soared ...