The degree to which predicted pollutant concentrations are influenced by surface parameter

differences between the application site and the meteorological measurement site depends on the

nature of the application (i.e., release height, plume buoyancy, terrain influences, downwash

considerations, design metric, etc.). For example, a difference in zo for one application may

translate into an unacceptable difference in the design concentration, while for another

application the same difference in zo may lead to an insignificant difference in design

concentration. If the reviewing agency is uncertain as to the representativeness of a

meteorological measurement site, a site-specific sensitivity analysis may be needed in order to

quantify, in terms of expected changes in the design concentration, the significance of the

differences in each of the surface characteristics.


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