Hope M. Babcock , Washington, DC, and Sarah J. Fox were on the brief for amici curiae American Thoracic Society, et al. in support of petitioners Sierra Club, et al.
Thomas J. Ward , Washington, DC, was on the brief for amicus curiae The National Association of Home Builders in support of Industry and State Petitioners.
Jonathan Weiner , Deputy Attorney General, Office of the Attorney General for the State of California, argued the cause for State Amici in support of respondent. With him on the brief were Kamala D. Harris , Attorney General at the time the brief was filed, Robert W. Byrne , Senior Assistant Attorney General, and Gavin G. McCabe , Supervising Deputy Attorney General. Melinda Pilling , Attorney, entered an appearance.
Before: Griffith, Pillard and Wilkins, Circuit Judges.
Per Curiam:
In this opinion, we consider various challenges to the Environmental Protection Agency's 2015 revisions to the primary and secondary national ambient air quality standards for ozone. For the reasons given below, we deny the petitions, except with respect to the secondary ozone standard, which we remand for reconsideration, and grandfathering...
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