PHILADELPHIA (CBS) -- Hard to believe it has been a year since Philadelphia took center stage as smoke from the Canadian wildfires left the city with the worst air quality on the planet for a day.

The tri-state area, along with most of the northeast and mid-Atlantic regions, continues to choke under prolonged exposure to the dense smoke filtering in from Quebec, Canada this week. It is the ...

A special air quality statement has been issued by Environment Canada regarding the western Canadian wildfire smoke that has drifted into eastern Ontario and southern Quebec on Friday morning. The ...