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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.

 
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 
EO 13771 Designation: uncollected 
CFR Citation: 40 CFR 50   
Legal Authority: Clean Air Act   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  08/11/2016  81 FR 53097   
Direct Final Rule  08/11/2016  81 FR 53006   
NPRM Comment Period End  09/12/2016 
Direct Final Rule Comment Period End  09/12/2016 
Withdrawal Notice  09/29/2016  81 FR 66823   
Final Rule  12/00/2016 
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