Air quality is unhealthier-than-average for some people Thursday as winds are blowing wildfire smoke across the Northern California region.

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

The EPA's Air Quality Index can tell you whether breathing outside air can be harmful. Here's how to read the scale to plan accordingly in Michigan.

Wildfire smoke and pollution is creating unhealthy air over Shasta County. Here's what you can do about it.

A series of maps showed data for multiple types of pollutant.

Los Angeles County is the focus of an updated air quality alert reported at 5:03 p.m. on Wednesday by the National Weather Service. The alert is in effect until Thursday July 10, at 8:15 p.m.

5 Freeway north of LA is the focus of an updated air quality alert reported at 5:03 p.m. on Wednesday by the National Weather Service. The alert is in effect until Thursday July 10, at 8:15 p.m.

On Saturday at 3:45 p.m. the National Weather Service reported an air quality alert in effect until Monday at midnight for Monmouth County.

Residents in lower-income areas, often near highways and industrial sites, still breathe some of the dirtiest air in the state.