The sunset is seen as wildfire smoke shrouds Toronto, Canada, on July 16, 2026. Wildfires sweeping across northwestern Ontario, Canada, in recent days have caused severe smog and a sharp deterioration in air quality in several regions, including Ottawa, the nation's capital, and Toronto, Canada's largest city. (Photo by Zou Zheng/Xinhua)

The sunset is seen as wildfire smoke shrouds Toronto, Canada, on July 16, 2026. Wildfires sweeping across northwestern Ontario, Canada, in recent days have caused severe smog and a sharp deterioration in air quality in several regions, including Ottawa, the nation's capital, and Toronto, Canada's largest city. (Photo by Zou Zheng/Xinhua)

The sunset is seen as wildfire smoke shrouds Toronto, Canada, on July 16, 2026. Wildfires sweeping across northwestern Ontario, Canada, in recent days have caused severe smog and a sharp deterioration in air quality in several regions, including Ottawa, the nation's capital, and Toronto, Canada's largest city. (Photo by Zou Zheng/Xinhua)

The sunset is seen as wildfire smoke shrouds Toronto, Canada, on July 16, 2026. Wildfires sweeping across northwestern Ontario, Canada, in recent days have caused severe smog and a sharp deterioration in air quality in several regions, including Ottawa, the nation's capital, and Toronto, Canada's largest city. (Photo by Zou Zheng/Xinhua)

The sunset is seen as wildfire smoke shrouds Toronto, Canada, on July 16, 2026. Wildfires sweeping across northwestern Ontario, Canada, in recent days have caused severe smog and a sharp deterioration in air quality in several regions, including Ottawa, the nation's capital, and Toronto, Canada's largest city. (Photo by Zou Zheng/Xinhua)

The sunset is seen as wildfire smoke shrouds Toronto, Canada, on July 16, 2026. Wildfires sweeping across northwestern Ontario, Canada, in recent days have caused severe smog and a sharp deterioration in air quality in several regions, including Ottawa, the nation's capital, and Toronto, Canada's largest city. (Photo by Zou Zheng/Xinhua)