The Chicago area recorded ozone levels of 156 late Monday afternoon. Levels above 100 are considered unhealthy. Residents ...

An Air Quality Alert will be in effect through midnight Tuesday for Southeast Michigan, the state's Department of Environment ...

The National Weather Service reported an air quality alert at 12:35 p.m. EDT on Monday in effect until Wednesday at midnight ...

On Monday at 10:07 a.m. an air quality alert was reported by the National Weather Service in effect until Tuesday at midnight ...

Crews are battling the Max Fire, which has burned 426 acres in Fresno County with 5% containment as of 5:00 p.m. Monday.

The poor air quality that has blanketed swaths of central and Western Canada is not only infiltrating the lungs, but also ...

With wildfire smoke in the forecast, track the drop in air quality across dozens of PurpleAir sensors with our live, updating ...

Much of Central Canada, Manitoba and Saskatchewan were placed under special air quality statements or warnings on Monday due ...

Unhealthy air has invaded Minnesota, Wisconsin and North Dakota early this week as a new round of wildfire smoke from Canada ...

The Air Quality Index (AQI) is a national system developed by the U.S. Environmental Protection Agency (EPA) to translate various air pollutant concentrations into a single, easy-to-understand number.

Canadian wildfire smoke lingers in Michigan. Officials issued an air quality advisory in southeast Michigan for July 15.

More than 80 Canadian wildfires are impacting the air quality in Upper Michigan. Conditions are expected to improve this week ...