GINSBURG, Senior Circuit Judge:
In 2010, the EPA promulgated a final rule adopting a new, one-hour primary national ambient air quality standard (NAAQS) for nitrogen dioxide. The American Petroleum Institute, the Utility Air Regulatory Group, and the Interstate Natural Gas Association of America (collectively the API) petition for review of that rule, claiming the EPA, in adopting the NAAQS, was arbitrary and capricious and violated the Clean Air Act. The API also...
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