Wildfire smoke from fires in northwest Canada have spread from the U.S. border with Canada down through the Midwest and New York. The line of smoke has gone as far south as Miami While Miami’s air quality is much better than New York’s,

Wildfire smoke was helping raise ozone to hazardous levels. No alerts have been issued, but the air quality may approach “code orange” levels again late Thursday afternoon in parts of the region, as it appears that the ozone factory will still be operating while the Canadian wildfire smoke persists in the skies over Philly.

Wildfire smoke is spreading throughout Central Canada and into parts of the U.S., with air quality warnings being issued in both countries.