Cities in the northeastern U.S., as well as Ontario and Quebec, have been battling smog from Canadian wildfires that have had a myriad of effects. An expert explains the dangers.
How the dangers of Canadian wildfires spread far beyond the flames


Cities in the northeastern U.S., as well as Ontario and Quebec, have been battling smog from Canadian wildfires that have had a myriad of effects. An expert explains the dangers.