Large areas of Southern British Columbia and Alberta are under air quality advisories, as smoke from several growing forest fires blots out the sun and rains ash particles on the region. Environment Canada’s air quality health index listed Cranbrook, Squamish and Whistler as “high risk” as of late Monday morning, while the Eastern Fraser Valley region was considered “very high risk.” The risk level had lowered somewhat by Monday evening, but was forecast to be high again in Eastern Fraser Valley on Tuesday. …Environment Canada meteorologist Danielle Desjardins said it’s hard to know when the smoke will clear, because that depends on how long the wildfires last, as well as ever-changing weather patterns. …Lori Daniels, a professor at the University of British Columbia’s department of forest and conservation sciences, said the fire season continuing well into September is “a little bit unusual.”