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Air quality in Northern

Air quality index (AQI⁺) and PM2.5 air pollution in Northern • 22:11, Jul 26

Close-up of an intense, blazing wildfire.
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Wildfire Map Spotlight: Big Grass Fire, Oregon and Idaho

Forest fire.
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Wildfire Map Spotlight: Kaiser Canyon Fire, Washington

Dry long grass burning.
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Wildfire Map Spotlight: Biscar Fire, California and Nevada

Which is the most polluted city in Northern?