Smoke from numerous Canadian wildfires is again impacting the Philadelphia region this week, with environmental authorities issuing code orange air quality alerts largely in effect through Tuesday as a result of the blazes’ aftermath settling in on the area.

Under a Code Orange alert, it's recommended that children, older adults and those with respiratory illnesses limit time spent outdoors.

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