In order to avoid overestimates for area sources during light wind conditions, it is recommended

that, where possible, a volume source approximation be used to model area sources. This

approach can be applied with confidence for situations in which the receptors are displaced from

the source. However, for applications where receptors are located either directly adjacent to, or

inside the area source, AERMOD’s area source algorithm will need to be used. For these

circumstances, caution should be exercised if excessive concentrations are predicted during

extremely light wind conditions. On a case-by-case basis, the reviewing authority should decide

whether such predictions are unrealistic. One possible remedy would be to treat such hourly

predictions as missing data.


It is EPA’s intention to correct this problem. A version of AERMOD that includes meander for

area sources will be developed as soon as practicable.



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