Dangerous wildfire smoke blankets 19 states, triggers air quality alerts for millions

Smoke from Canadian wildfires blankets major U.S. cities for third straight day

Toxic wildfire smoke threatens millions

The health risks of wildfire smoke across the Midwest and Mid-Atlantic

Midwest sees world's worst air quality as wildfire smoke spreads

North American wildfire smoke impacts flights, air quality

NBC Nightly News Full Episode - July 17

Smoke plume from wildfires in Canada visible from airplane

Canadian wildfire smoke affecting air quality conditions in U.S.

Air Quality Concerns Grow Over Canadian Wildfire Smoke in US

100 million Americans facing dangerous wildfire smoke

Canada Wildfires blanket New York with smoke ahead of FIFA Club World Cup final

Air Emergency: Canadian wildfire smoke engulfs US cities

Canadian wildfires spread as smoke prompts air quality alerts in 18 states

LIVE: Smoke rises over hills after wildfire in central Spain

Canadian wildfire smoke descends on parts of US, including New York City

Over 100 million under dangerous smoke alerts caused by Canadian wildfires

Air quality warnings across multiple states as Canadian wildfires burn

Canadian wildfire smoke reaches U.S. causing unhealthy air quality