Wildfire_crop

An Oregon wildfire burns in 2013. The increasingly widespread wildfires in the Pacific Northwest are affecting air pollution across North America. (Photo by Bureau of Land Management.)

An Oregon wildfire burns in 2013. The increasingly widespread wildfires in the Pacific Northwest are affecting air pollution across North America. — An Oregon wildfire burns in 2013. The increasingly widespread wildfires in the Pacific Northwest are affecting air pollution across North America. (Photo by Bureau of Land Management.)

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