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Bloomberg News | May 1, 2012 : EPA determines SW Wyoming to have unsafe ozone levels
Wyoming’s southwestern region was found to have an unsafe level of smog-causing ozone, a designation the U.S. Environmental Protection Agency linked to a boom in oil and gas drilling in the state.
The EPA included the Upper Green River Basin in its list of areas nationwide exceeding an ozone standard set in 2008 during the administration of President George W. Bush. Wyoming until today was the only state where all counties had met the federal ozone limit.