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

Firefighters in Utah, Arizona and California are all battling wildfires, including the still-growing blaze that closed the Northern Rim of the Grand Canyon. In the Midwest and East, a thick haze in the sky caused by smoke from more than 700 Canadian wildfires have prompted air quality alerts in ten states.

An air quality alert is in effect today for NYC, as well as Dutchess, Orange, Putnam, Rockland, Sullivan, Ulster and Westchester counties.