where ziu0 is the reference height of 400 meters corresponding to the reference population, P0, of

2,000,000. Exclusion of these elevated sources from application of the urban option must be

justified on a case-by-case basis in consultation with the appropriate reviewing authority.

 

5.2 SELECTING POPULATION DATA FOR AERMOD’S URBAN MODE (10/19/07)

 

For relatively isolated urban areas, the user may use published census data corresponding to the

Metropolitan Statistical Area (MSA) for that location. For urban areas adjacent to or near other

urban areas, or part of urban corridors, the user should attempt to identify that part of the urban

area that will contribute to the urban heat island plume affecting the source(s). If this approach

results in the identification of clearly defined MSAs, then census data may be used as above to

determine the appropriate population for input to AERMOD. Use of population based on the

Consolidated MSA (CMSA) for applications within urban corridors is not recommended, since

this may tend to overstate the urban heat island effect.

 

 

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