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Air quality in Western Region

Air quality index (AQI⁺) and PM2.5 air pollution in Western Region • 22:50, Jul 19

Huge wildfire
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Wildfire Map Spotlight: Snyder, Babylon, Ferris, and Gold Mountain Fires in Colorado and Utah

Wildfire on a mountain
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Wildfire Map Spotlight: Kane Springs Fire and Grapevine Fire, Nevada

Forest fire.
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Wildfire Map Spotlight: North-Central and Eastern Oregon Wildfires

Which is the most polluted city in Western Region?