For more details about the enhancements, see the AERMOD User’s guide Addendum (U. S.

27 EPA, 2012a).

28

29 Ideally, all explicitly modeled sources, receptors, and background should be modeled in

30 one AERMOD run for all modeled years. In this case, one of the above output options can be

31 used in AERMOD to calculate design values for comparison to the NAAQS and determine the

32 area’s attainment status and/or inform attainment/nonattainment boundaries. The use of these

33 options in AERMOD allows AERMOD to internally calculate concentration metrics that can be

34 used to calculate design values and, therefore, lessen the need for large output files, i.e. hourly

35 POSTFILES.

36

37 However, there may be situations where a single AERMOD run with all explicitly

38 modeled sources is not possible. These situations often arise due to runtime or storage space

39 considerations during the AERMOD modeling. Sometimes separate AERMOD runs are done

40 for each facility or group of facilities, or by year, or the receptor network is divided into separate

41 sub-networks. In some types of these situations, the MAXDCONT output option may not be an

42 option for design value calculations, especially if all sources are not included in a single run. If

29 By international convention, mandatory levels are in millibars: 1,000, 850, 700, 500, 400, 300, 200, 150, 100, 50,

30, 20, 10, 7 5, 3, 2, and 1. Significant levels may vary depending on the meteorological conditions at the upper-air

station.

 

 

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