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One commenter stated that “nonattainment areas projected to attain the standard with out additional state-level actions might not need the PAMS sources and additional monitoring to develop a better understanding of their teacher voice levels owl poster ozone points.” One commenter famous that “marginal ozone nonattainment areas are given only some necessities as a result of it is assumed that the

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pollutants in ambient air. FRMs for various pollution are described in several appendixes to 40 CFR part 50. For most gaseous criteria pollution , the FRM is described as a particular measurement principle and calibration procedure to be implemented, with further reference to particular analyzer performance necessities specified in 40 CFR part fifty three. The EPA acknowledges that the changes to the PAMS necessities will require sources and a reasonable timeline to be able to be successfully applied. The PAMS program is funded, in part, as a part of the EPA’s part 105 grants. The EPA believes that the current national funding stage of the PAMS program is teacher voice levels owl poster enough to assist these final adjustments, however modifications in the distribution of PAMS funds will must be made. The network design modifications will require some monitoring businesses to start out assortment of new PAMS measurements, whereas other monitoring agencies will see reductions in PAMS measurement necessities. The EPA will work with the NAACA, AAPCA, and different monitoring businesses to develop an applicable PAMS grant distribution technique. The EPA believes that the three-month PAMS season will present a constant information set of O3 and O3 precursor measurements for addressing the nationwide PAMS goals. Monitoring agencies are strongly encouraged to contemplate collecting PAMS measurements in further intervals beyond the required PAMS season as part of their EMP.

The monitoring agencies should think about factors such as the periods of anticipated peak O3 concentrations and regional consistency when determining potential expansion of their particular monitoring intervals beyond the required PAMS season. As discussed above, mixing height is one higher air meteorological measurement that has historically been measured at PAMS sites. A number of strategies can be used to measure mixing height in addition to radar profiler expertise mentioned above. Recent developments in ceilometer expertise enable for the measurement of blending height by modifications in particulate concentrations on the prime of the boundary layer (Eresmaa et al., 2006). Ceilometers provide the potential for steady mixing height data at a fraction of the cost of radar profilers. Due to the importance of blending peak measurements for O3 modeling, the EPA proposed to add the requirement for monitoring agencies to measure mixing height at required PAMS sites. In 2006, the EPA revised the PAMS necessities such that carbonyl sampling was only required in areas categorised as severe or above nonattainment for O3 beneath the eight-hour O3 standard which successfully lowered the applicability of carbonyl sampling to a few areas in California. This change was made in recognition that there have been a number of issues with Method TO-11A that raised issues with the uncertainty in the carbonyl knowledge being collected. These issues embrace interferences and breakthrough (i.e., overloading of the DNPH cartridge) at high concentrations. While options for these issues have been investigated, these improvements have not been included into Method TO-11A. We obtained comments on the proposed requirement for an EMP in states with O3 nonattainment areas. Most feedback supported the requirement, but different comments raised a number of considerations. A number of commenters questioned the need for EMPs in Marginal and Moderate O3 nonattainment areas. They noted that in most cases, Marginal O3 nonattainment areas have been expected to come back into compliance without state-particular controls.

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