As more than 800 wildfires burn across Canada, including dozens of out-of-control fires in western Ontario, the resulting smoke has worsened air quality in various parts of the United States, ...

Add Yahoo as a preferred source to see more of our stories on Google. As Michigan experiences its first real exposure to wildfire smoke this summer, weather forecasters are talking about the air ...

A maroon Air Quality Index indicates a health warning of emergency conditions, as everyone is likely to be affected.

As smoke from nearby wildfires spread across the Puget Sound region this week, agencies are urging residents to take precautions.

Hurricanes? We measure them with the Saffir-Simpson Scale.Earthquakes? The Magnitude Scale.Air quality? We have a scale for ...

Delaware is under a Code Orange air alert due to possible smoke from Canadian wildfires. Check to see latest air quality.

An air quality alert continues for the entire Chicago area Friday, with poor air quality due to smoke from Canada wildfires expected to stick around all day and even into Saturday, the NBC 5 Storm ...

Smoke from Canadian wildfires is once again impacting air quality in the Chicago area, with air quality index readings Thursday morning in the "unhealthy" category for some suburbs, according to ...