21 contribution of the source to the cumulative impacts at the receptor(s) showing violations and

22 accounts for the fact that modeled violations of the 24-hour NAAQS represent average impacts

23 across the modeling period.

1 V. PM2.5 Increment Analyses

2 Under Section 165(a)(3) of the CAA, a PSD permit applicant must demonstrate that

3 emissions from the proposed construction and operation of a facility ‘‘will not cause, or

4 contribute to, air pollution in excess of any (A) maximum allowable increase or maximum

5 allowable concentration for any pollutant * * *.’’ The ‘‘maximum allowable increase’’ of an air

6 pollutant that is allowed to occur above the applicable “baseline concentration”19 for that

7 pollutant is known as the PSD increment. By establishing the maximum allowable increase in a

8 particular area, an increment defines ‘‘significant deterioration’’ of air quality in that area.

9 Under the EPA’s 2010 Prevention of Significant Deterioration (PSD) for Particulate Matter Less

10 Than 2.5 Micrometers (PSD) - Increments, Significant Impact Levels (SIL) and Significant

11 Monitoring Concentration (SMC) final rule, increments for PM2.5 became applicable on October

12 20, 2011, at the levels shown in Table V-1 based on the averaging period and area classification.

 

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