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Accordingly, the most important NSR applications for O3 are utilized to emissions of VOC and NOX as pug sitting on toilet great ideas poster precursors of O3. The EPA’s implementing rules, the Exceptional Events Rule,

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applied in the course of the time between the date of the relevant nonattainment designation and the date on which the EPA approves into the SIP a NNSR program or additional components of an NNSR program for a selected pollutant. This interim program is usually known as the Emissions Offset Interpretative Rule, and is relevant to all standards pollutants, including O3. matter and the EPA isn’t making any revisions to the PSD requirements for O3 on this action to handle this concern. Therefore, the EPA just isn’t responding to those feedback at this time, consistent with its basic strategy to feedback on implementation subjects described pug sitting on toilet great ideas poster above. However, to assist tackle this concern raised by commenters, the EPA is contemplating issuing further steerage on how PSD offsets could be carried out. Several commenters addressed statements that the EPA made regarding screening instruments for O3 within the preamble to the O3 NAAQS proposal. These statements weren’t linked to any proposed amendments to EPA regulations. Aside from adopting the grandfathering provision addressed in section VII of this preamble, the EPA isn’t revising the PSD necessities for O3 in this final rule. Therefore, the EPA just isn’t responding to those comments at this time, consistent with the EPA’s basic approach to feedback on implementation matters described above.

The EPA has traditionally allowed the use of screening and compliance demonstration tools to assist facilitate the implementation of the NSR program by reducing the supply’s burden and streamlining the permitting course of for circumstances where the emissions or ambient impacts of a selected pollutant might be thought-about de minimis. For instance, the EPA has established significant emission charges, or SERs, which are used as screening tools to find out when a pollutant could be thought-about to be emitted in a significant quantity and, accordingly, when the NSR necessities should be applied to that pollutant. See forty CFR. For O3, the EPA established a SER of 40 tpy for emissions of every O3 precursor—VOC and NOX. For PSD, the O3 SER applies independently to emissions of VOC and NOX to determine when the proposed main stationary source or major modification must bear PSD evaluate for that precursor and whether or not individual PSD requirements, corresponding to BACT, apply to that precursor. For PSD, a “major stationary source” is one which emits or has the potential to emit 250 tons per yr or extra of any regulated NSR pollutant, unless the brand new or modified supply is classed under an inventory of 28 source classes contained in the statutory definition of “main emitting facility” in part 169 of the CAA. For those 28 supply classes, a “main stationary source” is one which emits or has the potential to emit one hundred tpy or extra of any regulated NSR pollutant. A “major modification” is a bodily change or a change in the methodology of operation of an existing major stationary source that results first, in a major emissions improve of a regulated NSR pollutant for the project, and second, in a big internet emissions increase of that pollutant at the source. See 40 CFR.The EPA’s main NSR regulations define the term “regulated NSR pollutant” to include any pollutant for which a NAAQS has been promulgated and any pollutant recognized in EPA regulations as a constituent or precursor to such pollutant. Both the PSD and NNSR laws establish VOC and NOX as precursors to O3.

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