14 51.166(b)(21) allow for the reviewing authority to “presume that source-specific allowable

15 emissions for the unit are equivalent to the actual emissions of the unit.” Although the

16 discussion above focuses on increment consumption associated with emission increases,

17 decreases in actual emissions from increment-affecting sources may also be considered in the

18 PM2.5 increment analysis, which may result in expansion of the increment within the affected

19 baseline area.

20 In practice, three dates related to the PSD baseline concept are important in

21 understanding how to calculate the amount of increment consumed: (1) trigger date; (2) major

22 source baseline date; and (3) minor source baseline date. The 2010 Final Rule established

23 October 20, 2011, as the “trigger date” for PM2.5 increments. That is, the first complete PSD

 

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