A practical guide to PM2.5

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Courtesy of All4 Inc.

By now you’ve likely heard about U.S. EPA’s final rules governing the implementation of the New Source Review (NSR) program for fine particulate matter (i.e., particulate matter with an aerodynamic diameter less than 2.5 microns, or PM2.5). ALL4 published two articles in 2008 addressing specific aspects of the PM2.5 NSR rule. ALL4 has since formally established a PM2.5 Team to continue tracking the PM2.5 NSR rule and to communicate and address the challenges that the rule will present to our clients. This article has been prepared by the PM2.5 Team, and is the first in a series of articles in 2009 that will address various aspects of PM2.5 regulation.

Introduction

U.S. EPA published final rules governing the implementation of the NSR program for PM2.5 in the Federal Register on May 16, 2008 (the rules became effective on July 15, 2008). Specifically, the NSR program includes both the Prevention of Significant Deterioration (PSD) rules for areas that are designated as being in attainment with the PM2.5 National Ambient Air Quality Standards (NAAQS) and the Nonattainment New Source Review (NNSR) rules for areas designated as not being in attainment with the PM2.5 NAAQS.

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