13 resolution results that can be tracked with source apportionment tools or used in the

14 “brute force zero-out” approach to estimate new or modifying source impacts.

15

16 The NACAA Workgroup final report notes that these approaches represent

17 fundamentally different methods and may result in different estimates for secondary PM2.5

18 impacts depending on the non-linear chemical processes. The EPA, state/local permitting

19 agencies, and others within the atmospheric modeling community continue to apply these

20 techniques to test and evaluate their suitability for estimating single source impacts on

21 secondarily formed PM2.5. These efforts are critically important to inform current application of

22 these models and techniques for purposes of assessing the secondary PM2.5 impacts from a

23 proposed new or modifying source, as well as to inform efforts to evaluate updates to Appendix

 

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