Smoke from Canada's wildfires has reached as far as Norway

Amazon, Target modify deliveries in areas with poor air quality

Canada wildfires: Global help arrives as Quebec fights ‘historic’ fires

International help rolls in to fight persistent Canadian wildfires

Air quality: Surreal skies grip New Yorkers - in pictures

Mask and air filter sales spike on Amazon as Northeast still lives with smoke

Delhi: The city where it is dangerous to breathe

Smoky, dangerous haze parked over U.S. East Coast for second day

Air quality: How to protect yourself from Canada wildfire smoke

Wildfires -- and their toxic smoke -- are affecting us more often. What can we do about it?

La Guardia and Newark flight delays over Canada wildfire smoke

Wildfire smoke from Canada disrupts New York flights