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Technical Correction of the National Ambient Air Quality Standards for Particulate Matter (Final)
Aug. 11, 2016
EPA is taking direct final action to make a technical correction to an equation in an appendix in the National Ambient Air Quality Standards (NAAQS) for Particle Pollution. Equation 2 describes an intermediate step in the calculation of the design value for the annual PM2.5 (particles with an aerodynamic diameter less than or equal to a nominal 2.5 micrometers) NAAQS. This action corrects a scrivener's error in one of the equations used to calculate an annual mean PM2.5 concentration, to properly account for cases where a site does not have four complete quarters of data and passes one of two substitution tests. This change accurately reflects the intended calculation of the annual mean PM2.5 design value and is consistent with the text elsewhere in the appendix. This rule is effective on 11 October 2016 without further notice, unless the EPA receives adverse comment by 12 September 2016. If the EPA receives adverse comment, they will publish a timely withdrawal in the Federal Register informing the public that the rule will not take effect. POC is Mr. Brett Gantt, U.S. EPA, Office of Air Quality Planning and Standards, Air Quality Assessment Division, Air Quality Analysis Group (Mail Code: C304-04), Research Triangle Park, NC 27711; tel: (919) 541-5274; fax: 919-541-3613; email address: gantt.brett@epa.gov (Federal Register; 11 August 2016 [Rules and Regulations], pages 53006-53008).

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Last Updated: January 22, 2018