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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 

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 
CFR Citation: 40 CFR 50   
Legal Authority: Clean Air Act   
Legal Deadline:  None
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
Research Triangle Park, NC 27709
Phone:919 541-5274