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

Plumes of Canadian wildfire smoke engulf major US cities

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

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

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

Wildfire smoke brings world's worst air quality to Toronto

Detroit locals say stay inside as Canadian wildfire smoke engulfs city