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

Wildfires burning in Canada were causing unhealthy air quality across parts of North America on Monday. Canadian wildfires burning across northern Manitoba and Saskatchewan are sending smoke through central Canada, the Great Lakes region and the northeastern United States, reducing air quality and visibility in major cities.

Smoke from wildfires burning in Canada is filling the skies high above New Hampshire on Monday, triggering concerns about the air quality. An air quality alert is in effect for all of New Hampshire through 11 p.