Smoke from Canadian wildfires is causing air quality concerns for millions of Americans in the Midwest and Northeast.

An updated air quality alert was reported by the National Weather Service on Tuesday at 4:52 p.m. in effect until Thursday at midnight for Northern Centre and Southern Centre as well as Huntingdon, Franklin,

At 4:19 p.m. on Tuesday, the National Weather Service reported an updated air quality alert in effect until Wednesday at midnight for Sussex, Warren, Morris, Hunterdon and Somerset counties.