21contribution of the source to the cumulative impacts at the receptor(s) showing violations and
22accounts for the fact that modeled violations of the 24-hour NAAQS represent average impacts
23across the modeling period.
1V. PM2.5 Increment Analyses
2Under Section 165(a)(3) of the CAA, a PSD permit applicant must demonstrate that
3emissions from the proposed construction and operation of a facility ‘‘will not cause, or
4contribute to, air pollution in excess of any (A) maximum allowable increase or maximum
5allowable concentration for any pollutant * * *.’’ The ‘‘maximum allowable increase’’ of an air
6pollutant that is allowed to occur above the applicable “baseline concentration”19 for that
7pollutant is known as the PSD increment. By establishing the maximum allowable increase in a
8particular area, an increment defines ‘‘significant deterioration’’ of air quality in that area.
9Under the EPA’s 2010 Prevention of Significant Deterioration (PSD) for Particulate Matter Less
10Than 2.5 Micrometers (PSD) - Increments, Significant Impact Levels (SIL) and Significant
11Monitoring Concentration (SMC) final rule, increments for PM2.5 became applicable on October
1220, 2011, at the levels shown in Table V-1 based on the averaging period and area classification.
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