Multiple U.S. states and Canadian provinces are experiencing poor air quality from wildfire smoke. Here's where.

The Cram fire is the largest in the state, expanding overnight to more than 64,000 acres, according to the Northwest ...

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

Air pollution levels over Redding and parts of Shasta County are close to hazardous levels at times, due to heavy Green Fire ...

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 ...

Prepare for poor air quality from Canadian wildfire smoke and rising temperatures today, with rain and thunderstorms expected ...

Smoke from wildfires in Manitoba, a Western province facing its worst fire season in 30 years, has created hazardous air ...

Smoke and haze could arrive in parts of the Bay Area on Friday thanks to wildfires in the northern portion of the state. The ...

Redmond had the worst air quality in the state Wednesday afternoon, with DEQ's air quality monitoring map showing "unhealthy" ...

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

An air quality alert is in effect for parts of northern Minnesota as wildfire smoke from fires burning in Canada again drifts south.

The air quality is poor today in northern Illinois due to migrating Canadian wildfire smoke. See the AQI in your area.