KAVANAUGH, Circuit Judge:
In 2013, EPA tightened the primary National Ambient Air Quality Standards, or NAAQS, for fine particulate matter. The National Association of Manufacturers and other industry groups challenge that decision. Consistent with the general principle that the Clean Air Act gives EPA substantial discretion in setting the NAAQS, we deny the petitions for review.
I
The Clean Air Act requires EPA to establish National Ambient Air...
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