Millions in the United States are facing another day of hazy skies fueled by hundreds of smoky wildfires burning across North America, impacting air quality in parts of the U.S. and raising health concerns.

Wildfires raging across remote areas of northwest Canada are proving nearly impossible to contain, according to the Times Union. With more than 200 active fires, many in roadless, unmanaged forest, Canadian firefighters remain overwhelmed—leaving much of the Northeast,