Particle pollution is a “key ingredient” of wildfire smoke, Barrett told CNN. “Sometimes we can see, smell, and even taste the impacts of wildfire smoke,” Barrett said. Mountain ranges can shield some regions from worse air pollution by keeping smoke aloft when it travels, Mass said. Pittsburgh - June 29, 2023An MLB game between the San Diego Padres and Pittsburgh Pirates is delayed as Canadian wildfire smoke descends on downtown Pittsburgh. San Francisco - Sept. 9, 2020Smoke from northern California wildfires casts a reddish glow in San Francisco, California.

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