Hundreds of wildfires still burning in Canada are expected to undermine air quality across the Upper Midwest and Northeast into Tuesday.

With hundreds of wildfires burning across Canada, smoke has drifted into the northern United States, lowering air quality across roughly a dozen states.

Smoke from wildfires burning in Canada is still lingering high above New Hampshire skies, raising concerns about air quality. An air quality alert will be in effect for all of New Hampshire on Tuesday.