particular PM2.5 baseline area and any prior emission increases 1 at major sources that have been

2 newly constructed or modified since the major source baseline date. When the net impact

3 resulting from total emissions changes of both direct PM2.5 and precursor emissions impacting a

4 particular PM2.5 baseline area exceeds the maximum pollutant concentration increase defined by

5 the PM2.5 increment, additional PSD permits for PM2.5 cannot be issued in that area until

6 sufficient amounts of the increment are ‘‘freed up’’ via emissions reductions that may occur

7 voluntarily (e.g., via source shutdowns) or by mandatory control requirements imposed by the

8 reviewing authority. Moreover, the PM2.5 air quality in a region cannot deteriorate to a level in

9 excess of the applicable PM2.5 NAAQS, even if the PM2.5 increment in the area has not been

10 fully consumed. Therefore, new or modified sources located in areas where the PM2.5

11 concentrations are near the level allowed by the PM2.5 NAAQS may not have full use of the

12 amount of ambient PM2.5 concentration increase allowed by the increment.

13 With these differences in mind, some of the recommendations provided above in Sections

14 III and IV for PM2.5 NAAQS compliance demonstrations based on the four assessment cases

15 may also be applicable for increment analyses. For example, the increment assessment


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