AERMOD requires the input of urban population when utilizing the urban option.

23 Population can be entered to one or two significant digits (i.e., an urban population of 1,674,365

24 can be entered as 1,700,000). Users can enter multiple urban areas and populations using the

25 URBANOPT keyword in the runstream file (U.S. EPA, 2004a; U.S. EPA, 2012a). If multiple

26 urban areas are entered, AERMOD requires that each urban source be associated with a

27 particular urban area or AERMOD model calculations will abort. Urban populations can be

28 determined by using a method described in Section 5.2 of the AIG (U.S. EPA, 2009).


2.5. Source groups


32 In AERMOD, individual emission sources’ concentration results can be combined into

33 groups using the SRCGROUP keyword (Section 3.3.11 of the AERMOD User’s Guide (U.S,

34 EPA, 2004a). The user can automatically calculate a total concentration (from all sources) using

35 the SRCGROUP ALL keyword. For the purposes of design value calculations, source group

36 ALL should be used, especially if all sources in the modeling domain are modeled in one

37 AERMOD run. Design values should be calculated from the total concentrations (all sources

38 and background). Individual source contributions outputs to the total concentration may be

39 necessary to determine the culpability to any NAAQS violations.


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