15 that it may be warranted in some cases given the additional challenges associated with PM2.5

16 increment analyses due to secondary impacts from precursor emissions. Early coordination with

17 the appropriate reviewing authority is encouraged to identify the appropriate baseline

18 concentration and baseline area for the proposed new or modified source, and the appropriate

19 inventory of increment-affecting sources.

20 Once a PM2.5 minor source baseline date is established for an area, the new emissions

21 increase (including direct PM2.5 and precursor emissions) from the major source that triggers the

22 baseline date consumes a portion of the PM2.5 increment in that baseline area, as do any

23 subsequent emission increases that occur from any new or existing sources that affect that

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castellano: DIS CUS DES  RAD   english: DIS CUS DES RAD  

 

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