Millions in the U.S. face health threats as Canadian wildfire smoke causes air quality to plummet and triggers official advisories.

I RYU/VCG via Getty ImagesRed flag warnings remain in place for parts of Nevada, Utah, Colorado and Wyoming due to very dry conditions, low humidity and gusty winds and fires in these areas may ...

Smoke from hundreds of wildfires in Canada is lingering over the northern U.S., spreading across to roughly a dozen states from Wisconsin to Maine.

While an air quality alert continues for parts of the Midwest due to smoke from Canadian wildfires, northeastern Illinois was ...

Air quality levels across the Stateline this morning are back down to level 2 of 6 “moderate” levels. There are even a few locales up in southern Wisconsin where the Air Quality Index ...

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As Canadian wildfires spread smoke across the U.S. the air pollution is dangerous to health. But there are ways to protect ...