See before-and-after images of US landmarks as they get inundated with wildfire smoke

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?

Wildfire smoke continues to wreak havoc on US sports

AirNow’s Interactive Map Shows You the Air Quality Index in Your Area

La Guardia and Newark flight delays over Canada wildfire smoke

Wildfire smoke from Canada disrupts New York flights

4 Ways to Stay Safe When Wildfire Smoke Causes Poor Air Quality