![FILE - The Denver skyline is illuminated as the sun sets behind the Rocky Mountains on Dec. 3, 2021. The U.S. Environmental Agency is proposing to downgrade Colorado's biggest population center from FILE - The Denver skyline is illuminated as the sun sets behind the Rocky Mountains on Dec. 3, 2021. The U.S. Environmental Agency is proposing to downgrade Colorado's biggest population center from](https://c8.alamy.com/comp/2MBN47D/file-the-denver-skyline-is-illuminated-as-the-sun-sets-behind-the-rocky-mountains-on-dec-3-2021-the-us-environmental-agency-is-proposing-to-downgrade-colorados-biggest-population-center-from-a-serious-to-a-severe-violator-of-federal-ozone-standards-a-move-that-would-force-the-state-and-industry-to-adopt-tougher-local-rules-to-improve-air-quality-ap-photodavid-zalubowski-file-2MBN47D.jpg)
FILE - The Denver skyline is illuminated as the sun sets behind the Rocky Mountains on Dec. 3, 2021. The U.S. Environmental Agency is proposing to downgrade Colorado's biggest population center from
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