Wildfire smoke will linger and spread this weekend. See which cities are most affected. – The Washington Post

Wildfire smoke will linger and spread this weekend. See which cities are most affected. The Washington Post
Wildfire smoke is driving terrible air quality in major cities, but relief is coming CNN
Just Ask the Dinosaurs How Bad Air Quality Can Get The Atlantic
Unhealthy air quality continues Friday evening in the Baltimore area WBAL-TV
Chicago Air Quality Alert in effect, extended through Saturday night with index at unhealthy levels from Canadian wildfire smoke ABC7 Chicago