Air quality has taken a serious hit across the United States as a twofold 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 Canadian wildfires is causing air quality concerns for millions of Americans in the Midwest and Northeast. Air quality alerts were in effect Tuesday in several states, including Wisconsin,

Smoke from wildfires in California has been drifting south and east, impacting much of Southern California and parts of Nevada and Utah, and San Diego can expect hazy skies and poor air quality for at least a few more days.