Canada wildfires: Smog spreads south as east coast sees relief

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

Delhi: The city where it is dangerous to breathe

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

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