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View Diary: In Major Decision to Benefit Climate Change Mitigation;SCOTUS Rejects Challenge to EPA Authority (73 comments)

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    statement of what the standard does.   Not every excursion above the 100 ppm NO2 NAAQS standard actually constitutes a legal violation of the NO2 NAAQS.

    Compliance with this standard is measured on the basis of the 3 year average of daily maximum 1 hour concentrations occurring at the 99% percentile level.

    In other words, the standard is not legally violated unless  a running 3 year average determined for the 99% percentile value of all daily 1 hour maximum concentrations determined on a calender block year basis exceed the 100 ppb level of the standard.    Single excursions over the 100 ppb level of the standard, per se, do not constitute legal violations of the NAAQS.

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