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 by Liang Sen/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 by Liang Sen/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 by Liang Sen/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 by Liang Sen/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 by Liang Sen/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 by Liang Sen/Xinhua）