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A person jogs along the Stanley Park seawall in Vancouver, Canada, with a view of the skyline under a heavy smog from clouds and smoke due to forest fires in Washington, Oregon and California, September 17, 2020. South western British Columbia has been covered in smog from clouds and smoke due to forest fires in Washington, Oregon and California. Thanks to strong pressure systems, the smoke from the fires was trapped along the western part of North America for days, making for potentially dangerous air quality in major cities such as Portland, Oregon and Vancouver and San Francisco. (Photo by Don MacKinnon / AFP) (Photo by DON MACKINNON/AFP via Getty Images)