Wildfires in Canada have forced thousands of residents to evacuate in three provinces, impacting air quality in the U.S. — and smoke from the deadly fires has even blown across the Atlantic and reached parts of Europe.

Smoke from wildfires raging in Canada has drifted into the United States, affecting air quality as far south as Florida.

The pull of the foul air to Northern California was significant enough that the Bay Area Air District issued an air quality advisory. According to AirNow, a federal air-quality measuring app that measures air quality in real time, the air quality at 2 p.m. through much of the region was only moderately healthy.