PORTLAND, Maine (AP) — Smoke from Canadian wildfires worsened air quality in the eastern U.S. on Wednesday as several Midwestern states battled conditions deemed unhealthy by the federal government.

Continued drifting of wildfire smoke from Canada and Alaska has prompted Bay Area air regulators to extend an air quality ...

As Canada endures another heavy wildfire season, a group of resourceful farmers in British Columbia became an ad hoc fire ...

There were no air quality alerts across the U.S. early Friday, following a flurry of warnings partly linked to wildfires in Canada.

Maps show where new plumes of smoke will cause hazy skies through the end of the week. Low-level smoke is forecast to spread ...

The Maine Department of Environmental Protection says smoke from Canadian wildfires is again impacting air quality in Maine. Ground-level pollution concentrations in southwest coastal Maine were in ...