Air quality alerts are in effect on Tuesday in 10 states as toxic smoke from hundreds of wildfires burning in Canada continues to waft into the United States, creating hazy, gray skies over major metropolitan areas, including New York City.

An air quality alert is in effect for all of Massachusetts as smoke from Canadian wildfires descends into the Boston area.

An air quality alert issued today from the Clark County Division of Air Quality warns that wildfire smoke from Southern California will create poor air conditions