US East Coast sees worst air quality in years due to Canada wildfires

Smoke rises from Cameron Bluffs wildfire on Vancouver Island, British Columbia, Canada, June 9, 2023 in this screen grab obtained from a social media video.

A jogger wears a face mask due to a code orange air quality alert because of smoke from Canadian wildfires on June 9, 2023 in Washington, DC.

This June 8, 2023, handout still image from a video by British Columbia Wildfire Service, shows an aerial view of the West Kiskatinaw River wildfire located 10kms (6 miles) east of Tumbler Ridge, Canada.

Traffic crosses the Benjamin Franklin Bridge over the Delaware River between Pennsylvania and New Jersey as haze and smoke caused by wildfires in Canada hang over the Philadelphia skyline in Pennsylvania, U.S., June 8, 2023.

This June 8, 2023, handout still image from a video by British Columbia Wildfire Service, shows an aerial view of the West Kiskatinaw River wildfire located 10kms (6 miles) east of Tumbler Ridge, Canada.

A man wears a face mask during the morning commute due to a code orange air quality alert because of smoke from Canadian wildfires on June 9, 2023 in Washington, DC.

Downtown Washington, D.C. is seen shrouded in haze and smoke caused by wildfires in Canada, in Washington, U.S., June 8, 2023

An aerial view shows West Kiskatinaw River wildfire in British Columbia, Canada, June 9, 2023 in this screen grab obtained from a social media video.