Latest Canada wildfire updates: US extends air quality alerts
Wildfire smoke and air quality updates: Northeast flights disrupted
Wildfire smoke causes sports cancellations
Air quality: Canadian wildfire smoke blankets the U.S.
Belmont calls off racing, D-backs-Nats ppd. due to poor air
Smoky haze could last days as wildfires rage, winds won't budge
3rd day of smoky air gives millions in US East Coast, Canada new
Washington Nationals game postponed Thursday due to poor air
Washington Nationals game postponed due to hazardous air quality