People walk at a park under the smoky sky in Vancouver, British Columbia, Canada, Aug. 13, 2021. Vancouver was shrouded in smoke haze on Friday due to wildfires.Photo:Xinhua

People sit at a park under the smoky sky in Vancouver, British Columbia, Canada, Aug. 13, 2021. Vancouver was shrouded in smoke haze on Friday due to wildfires.Photo:Xinhua

A seaplane is about to land on water under the smoky sky in Vancouver, British Columbia, Canada, Aug. 13, 2021. Vancouver was shrouded in smoke haze on Friday due to wildfires.Photo:Xinhua

People sit at a park under the smoky sky in Vancouver, British Columbia, Canada, Aug. 13, 2021. Vancouver was shrouded in smoke haze on Friday due to wildfires.Photo:Xinhua

A man walks along the waterfront under the smoky sky in Vancouver, British Columbia, Canada, Aug. 13, 2021. Vancouver was shrouded in smoke haze on Friday due to wildfires.Photo:Xinhua

A car runs along a road under the smoky sky in Vancouver, British Columbia, Canada, Aug. 13, 2021. Vancouver was shrouded in smoke haze on Friday due to wildfires.Photo:Xinhua