The air quality index will be "unhealthy for sensitive groups" for both much of the state's shoreline and inland parts of ...

Smoke from wildfires in Canada has drifted into the U.S., prompting air quality alerts for Americans as it continues to spread. But when officials and forecasters classify a city's air as "unhealthy" ...

Over the past five years, as California wildfires increased in both intensity and scope, fall in the Bay Area has meant skies intermittently shrouded in smoke. This season, my morning routine has not ...

CLEVELAND — Air quality ratings for Sunday in Greater Cleveland improved from Saturday, but people with conditions that make ...

NEW YORK (WABC) -- The Air Quality Index is a scale used for daily reporting of how clean or polluted the air is, and what health effects might be of concern. The AQI focuses on what you might ...