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In this March 6, 2019, file photo, as traffic rolls along Speer Boulevard in the foreground, the skyline is shrouded as pollution fills the air in Denver. Colorado has taken the unusual step of inviting the U.S. Environmental Protection Agency to downgrade the air quality rating of the state’s biggest population center, and not everyone thinks that is a good idea. (AP Photo/David Zalubowski, File)

In this March 6, 2019, file photo, as traffic rolls along Speer Boulevard in the foreground, the skyline is shrouded as pollution fills the air in Denver. Colorado has taken the unusual step of inviting the U.S. Environmental Protection Agency to downgrade the air quality rating of the state’s biggest population center, and not everyone thinks that is a good idea. (AP Photo/David Zalubowski, File)

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