Smoke from uncontrolled wildfires along the U.S. West Coast is blowing eastward, stretching thousands of kilometres across Canada and covering several provinces. That is a result of smoke (well above our heads) from wildfires across the Western US. Notice that the smoke originates across the west and then gets pulled to the east due to the jet stream aloft. "Notice that the smoke originates across the west and then gets pulled to the east due to the jet stream aloft. teachers urged the province to close schools, citing the combined threat of wildfire smoke, which is affecting air quality, and the COVID-19 pandemic.

Source: CBC News September 15, 2020 14:51 UTC