Most of Minnesota and parts of Montana, North Dakota and Wisconsin were ranked “unhealthy” for air quality on a U.S. Environmental Protection Agency map.

BISMARCK, N.D. — (AP) — Much of the Upper Midwest on Saturday was dealing with swaths of unhealthy air because of drifting ...

Smoke from Canadian wildfires is expected to drift into North Dakota again in coming days, potentially degrading air quality.

Doctors are reporting an increase in respiratory issues as Canadian wildfire smoke combines with high heat, humidity and elevated pollen levels.

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

The Mid-Ohio Regional Planning Commission issued an air quality alert July 5 for the Columbus area as Canadian wildfire smoke, fireworks emissions and sunny weather were all predicted to lower the ...

The haze from the Canadian wildfire smoke has lingered around Northeast Ohio for days, though for the most part the air quality has remained safe.

Canadian wildfire smoke is back: Tips to keep it out of your home US and Canada wildfire smoke map: See air quality warnings near you ...

As wildfire smoke travels through the atmosphere, it also changes chemically to produce the toxic gas ozone, making breathing the stuff even more hazardous.

A wildfire raging along the Grand Canyon’s North Rim that leveled a historic lodge erupted over the weekend after burning for ...

Canadian wildfire haze probably led a west Michigan pilot to lose sight of the horizon, contributing to a June 2023 crash off Beaver Island that killed a Lowell woman, an NTSB investigation ...