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Maricopa County is failing the Environmental Protection Agency’s latest ozone standards. The EPA has has reclassified the county from marginal to moderate for non-attainment of ozone limits. (File photo by Kasey Brammell/Cronkite News)

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Maricopa County’s ozone levels are getting worse, harming the health of its 4.5 million residents and threatening to cost the region billions of dollars in the coming years.

By By Cole Januszewski, Cronkite News January 11, 2023
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