Smoke from Canadian wildfires poured into the US East Coast and Midwest on Wednesday, covering the capitals of both nations in an unhealthy haze, holding up flights at major airports, postponing Major League Baseball games and prompting people to fish out pandemic-era face masks. Canadian Wildfires: Millions Breathing Hazardous Air As Smoke From Raging Forest Fires in Canada Streams South Over US (See Pics and Videos).