Executive Summary 1 to the Draft Guidance

2 The U.S. Environmental Protection Agency (EPA) is providing the Draft Guidance for

3 PM2.5 Permit Modeling to the public for consideration, review, and comment. The Draft

4 Guidance for PM2.5 Permit Modeling incorporates the modeling procedures and

5 recommendations from the Stephen Page, March 23, 2010, guidance memorandum, “Modeling

6 Procedures for Demonstrating Compliance with PM2.5 NAAQS,” and further clarifies procedures

7 for adequately addressing primary and secondarily formed fine particulate matter (PM2.5) in a

8 National Ambient Air Quality Standard (NAAQS) and increment compliance demonstration

9 under Prevention of Significant Deterioration (PSD). This draft guidance document is also

10 consistent with the EPA’s Guideline on Air Quality Models, also published as Appendix W of 40

11 CFR Part 51. The release of the Guidance for PM2.5 Permit Modeling at the conclusion of this

12 review process will fulfill a need for additional guidance on demonstrating compliance with the

13 PM2.5 NAAQS, especially with regard to considerations of the secondarily formed component of

14 PM2.5, as noted in the March 23, 2010, Stephen Page guidance memorandum, and is consistent

 

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