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As mentioned in part IV.C.2 above, with examples, a primary commonplace with a particular averaging time and kind could provide the requisite public well being safety from well being results which might be most appropriately assessed utilizing an publicity metric hippie imagine all the people living life in peace all over print flag of a different averaging time and type and indicator, and the identical precept can apply when establishing or revising secondary standards. The Administrator recognizes that the exposure metric and the usual metric can be fairly related, as in the case of consideration of brief-

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whereas limiting the highest exposures, would, as a result of regional variation in meteorology and sources of O3 precursors, result in many areas with a lot lower exposures. Such variation in exposures occurring underneath a particular commonplace isn’t surprising and the general distribution of exposures estimated to occur with air high quality conditions associated with completely different alternative standards is a routine part of the consideration of public health safety in evaluations of main standards, and can also play a role in the review of secondary requirements. For these causes, and in gentle of the discussion in section IV.C.2.d above on consideration of “necessary” protection, the Administrator notes that an expectation of differing exposures just isn’t, in itself, a foundation for concluding that the air high quality would be greater than needed for the desired stage of public welfare hippie imagine all the people living life in peace all over print flag safety. Based on the concerns described here, together with the usage of an exposure metric that CASAC has agreed to be biologically related and applicable, related issues summarized in the proposal with regard to air high quality analyses and common makes use of of publicity metrics in different NAAQS reviews, the Administrator finds that, in combination with a revised level, the present kind and averaging time for a revised secondary standard could be anticipated to offer the specified level of public welfare protection.

Accordingly, she subsequent turns to the important consideration of a level that, together with the shape and averaging time, will yield a standard that specifies the requisite air quality for protection of public welfare. In so doing, she has recognized the recommendation by CASAC for revision of the shape and averaging time and provided the premise for her alternative view, as described above. Further, in the context of the Administrator’s choice on goals for public welfare protection of a revised secondary normal, and with consideration of the advice from CASAC on levels for a W126-based commonplace, the Administrator has also reached the conclusion, as described above, that to be able to present the appropriate diploma of public welfare safety, the revised secondary commonplace should limit cumulative seasonal exposures to 17 ppm-hrs or lower, in terms of a 3-12 months average W126 index, in almost all situations. Thus, the Administrator finds it applicable to revise the standard stage to one that, together with the form and averaging time, will exert this desired diploma of management for cumulative seasonal exposures. With regard to suggestions from the CASAC that the shape for the revised secondary normal ought to be the biologically related publicity metric, and related feedback from the public indicating that the secondary commonplace should have such a type, the Administrator disagrees. In so doing, she notes that CAA section 109 does not impose such a requirement on the shape or averaging time for the NAAQS, as explained in IV.C.2 above. She additional notes that the averaging time and form of major standards are often not the identical because the exposure metrics used in evaluations of main requirements, in which specific info on quantitative relationships between different publicity metrics and health risk is more typically out there than it is in critiques of secondary NAAQS.

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