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Thus, in contemplating the degree of public health protection applicable for the first O3 normal, the Administrator has thought-about quantitative exposure and danger estimates which might be primarily based a  american flag dirt racing all over print flag fourth-excessive type, and subsequently on a standard that, as these commenters point out, permits a number of days per yr with ambient O3 concentrations above the level of the standard. commenters’ assertion

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provides control of both the lengthy and short term exposures (e.g., from one hour to months or years) which may be of concern to public health. Similarly, in the course of the 1996 review of the NO2 major standard, whereas well being effects were recognized to result from both lengthy-time period and quick-term exposures to NO2, the first commonplace, which was a long-term commonplace, was concluded to offer the requisite protection towards both lengthy- and short-term exposures . In the following review of the NO2 primary standard during which the out there air high quality information indicated that the annual standard was not offering the needed control of the shorter term exposures, a further short-time period standard was established . Some commenters, including a regional group of state businesses and two teams of environmental organizations, american flag dirt racing all over print flag submitted comments recommending revision of the usual to a cumulative, seasonal form based on the W126 index. In help of their place, these commenters typically cited CASAC advice, variously moreover indicating their view that the standard kind ought to be a metric described as biologically related, and that the existing type, with a level within the proposed vary, would not provide sufficient ecosystem safety. Some commenters moreover suggested that the EPA cannot lawfully retain the shape and averaging time that have been initially established for purposes of the first commonplace when the EPA has recognized the W126 index as a metric appropriate for judging vegetation-related effects on public welfare. With regard to the EPA air high quality analyses, summarized in the proposal, of the W126 index values at sites where O3 concentrations met different levels of fourth-high metric, some of these commenters acknowledged that the analyses showed widespread variation in W126 values for each fourth-high metric examined.

Further, some commenters disagreed with the EPA that the analyses indicated that a revised standard level within the proposed range would be anticipated to limit W126 exposures in the future to the extent suggested by the analyses of data from the previous. Some commenters further contended that the extent of the primary O3 commonplace should be set below 70 ppb so as to compensate for the usage of a kind that enables a number of days with concentrations greater than the usual level. These groups submitted air high quality analyses to assist their level that the present fourth-excessive form allows multiple days per yr with ambient O3 concentrations above the level of the standard. While the EPA does not dispute the air quality analyses submitted by these commenters, and agrees that fourth-high kind permits a number of days per yr with ambient O3 concentrations above the extent of the usual (three days per year, on average over a three-yr period), the Agency disagrees with commenters’ assertion that, because of this, the extent of the primary O3 commonplace ought to be set beneath 70 ppb. As mentioned above (II.A.2), the quantitative assessments that knowledgeable the Administrator’s proposed determination, presented within the HREA and regarded in the PA and by CASAC, estimated O3 exposures and well being risks related to air quality that “simply meets” varied standards with the current eight-hour averaging time and fourth-high, three-year average type.

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