27 SCRAM website at http://www.epa.gov/ttn/scram/.

28

29 The following sections will refer to the relevant sections of Appendix W and other

30 existing guidance with summaries as necessary. Please refer to those original guidance

31 documents for full discussion and consult with the appropriate EPA Regional modeling contact if

32 questions arise about interpretation on modeling techniques and procedures.27

33

34 1. Model selection

35

36 Preferred air quality models for use in regulatory applications are addressed in Appendix

37 A of the EPA's Guideline on Air Quality Models. If a model is to be used for a particular

38 application, the user should follow the guidance on the preferred model for that application.

39 These models may be used without an area specific formal demonstration of applicability as long

40 as they are used as indicated in each model summary of Appendix A. Further recommendations

41 for the application of these models to specific source problems are found in Appendix W. In

27 A list of EPA Regional Office modeling contacts is available on the SCRAM website at:

http://www.epa.gov/ttn/scram/guidance_cont_regions.htm.

 

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