Wildfire smoke from Canada disrupts New York, Philadelphia flights
Wildfire smoke-laden haze could hang around Northeast and beyond
Air quality in NYC could improve Friday as Canada wildfires rage on
Wildfire smoke makes New York air quality worst in the world
Canada fires see U.S. East Coast air quality plummet: New York
Smog eases in New York but air pollution will linger over the US
Canadian wildfires force MLB, WNBA to postpone games due to poor
New York, Philly, Washington smothered in 'unhealthy' air as
Canada fires: Millions breathing hazardous air as smoke spreads
N.Y.C. has worst air quality in the world due to Canadian wildfires
Where is Canada wildfire smoke affecting US air quality? Map, updates.