Section 7.2.3 of the Guideline on Air Quality Models (EPA, 2005b) provides the basis for

determining the urban/rural status of a source. For most applications the Land Use Procedure

described in Section 7.2.3(c) is sufficient for determining the urban/rural status. However, there

may be sources located within an urban area, but located close enough to a body of water or to

other non-urban land use categories to result in a predominately rural land use classification

within 3 kilometers of the source following that procedure. Users are therefore cautioned against

applying the Land Use Procedure on a source-by-source basis, but should also consider the

potential for urban heat island influences across the full modeling domain. Furthermore, Section

7.2.3(f) of Appendix W recommends modeling all

sources within an urban complex using the

urban option even if some sources may be defined as rural based on the procedures outlined in

Section 7.2.3. Such an approach is consistent with the fact that the urban heat island is not a

localized effect, but is more regional in character.


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