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,

The run of mild summer weather in the Coachella Valley has come to an end. With smokey conditions likely worsening throughout Aug. 3, an air quality advisory was extended to noon Aug. 4. None pose an immediate threat to land, but some are worth watching.