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EPA/OAR | RIN: 2060-AS89 | Publication ID: Fall 2016 |
Title: Technical Correction to Part 50 of the National Ambient Air Quality Standards for Particulate Matter | |
Abstract:
The EPA modified an equation used when calculating the level of particulate matter (PM2.5) in the air, namely Equation 2 in appendix N to part 50, section 4.4(b). Original equation 2 was not appropriate as written and did not accurately reflect the intended calculation of the annual mean PM2.5 concentration. Equation 2 was modified to include calculation of the annual mean PM2.5 concentration in cases where a site does not have four complete quarters of data, but passes one of two substitution tests described in sections 4.1(c)(i) and 4.1(c)(ii). This adjustment to Equation 2 is a currently used calculation of the PM2.5 annual design value, is consistent with the text of section 4.1 within appendix N to Part 50, and does not affect the calculation of annual mean PM2.5 concentrations when four complete quarters of data are available. |
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Agency: Environmental Protection Agency(EPA) | Priority: Substantive, Nonsignificant |
RIN Status: Previously published in the Unified Agenda | Agenda Stage of Rulemaking: Final Rule Stage |
Major: No | Unfunded Mandates: No |
CFR Citation: 40 CFR 50 | |
Legal Authority: Clean Air Act |
Legal Deadline:
None |
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Timetable:
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Regulatory Flexibility Analysis Required: No | Government Levels Affected: Federal, Local, State |
Small Entities Affected: No | Federalism: No |
Included in the Regulatory Plan: No | |
RIN Data Printed in the FR: No | |
Agency Contact: Brett Gantt Environmental Protection Agency Office of Air and Radiation C304-04, Research Triangle Park, NC 27709 Phone:919 541-5274 Email: gantt.brett@epa.gov |