US East Coast blanketed in eerie veil of smoke from Canada fires

[Collection]Schools across the US East Coast cancelled outdoor activities, commercial airline traffic was slowed and millions of Americans were urged to stay indoors on Wednesday as smoke from Canadian wildfires drifted south, blanketing cities in a thick yellowish haze. "It's critical that Americans experiencing dangerous air pollution, especially those with health conditions, listen to local authorities to protect themselves and their families," US President Joe Biden said on Twitter.