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

Fortunately, the US Environmental Protection Agency has a resource called the Air Quality Index to help monitor air quality.

There's confusion over how safe air quality is in L.A. as fires continue to burn, spewing wildfire smoke and toxins. We look at air quality readings, what's real and what's not and what people can do.

Air quality remained far from ideal Wednesday in much of the Bay Area. As of 11:30 a.m., sensors from Purple Air showed air quality in San Francisco, Marin, the East Bay and the eastern side of ...