From Thomson Reuters Foundation:
Crooner Perry Como once sang “the bluest skies you’ve ever seen are in Seattle,” but this week the city registered its worse air quality of the past two decades.
Smoke from wildfires is filling the summer skies in western U.S. and Canadian cities so badly that weather experts are calling on officials to tackle “smoke season” with the same urgency they use with heat waves and cold snaps. “There’s a smoke season, and it’s probably going to be more frequent and longer than it has been in previous years,” said Environment and Climate Change Canada meteorologist Armel Castellan.