The Air Quality Index, set by the Environmental Protection Agency, is your guide to how bad the air quality is outdoors. The data that goes into the Air Quality Index comes from 5,000 air monitors ...

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

According to the New York Times, if your neighborhood has an AQI — or, air quality index — above 200 ... has developed an online calculator to help those with a penchant for doomsday thinking ...