Canadian wildfire smoke drifts into the US

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

Aerial video: Wildfire smoke blankets Ontario as fires burn across Canada

North American wildfire smoke affects flights, air quality

Wildfire smoke covers DC as officials warn of health risks

Smoke plume from wildfires in Canada visible from airplane

Plumes of Canadian wildfire smoke engulf major US cities

Orange skies over parts of US and Canada engulfed in wildfire smoke

Canada wildfire smoke continues to bring unhealthy air quality to Midwest, Northeast