Air quality has taken a serious hit across the United States as a two-fold blow of wildfires in the West and in Canada have sent smoke pouring across large sections of the country — a problem that’s set to linger for days.

Smoke from wildfires in Canada continue to impact Greater Akron. An Air Quality Alert has been issued for northern Ohio for Friday. AirNow that monitors pollution says the air quality in the region may be harmful for sensitive groups, including children, the elderly and those with breathing difficulties.

As Canada grapples with one of its worst wildfire seasons on record, smoke from the blazes have prompted air quality alerts across the U.S.