Air Dispersion Modeling

Air Dispersion Modeling is used to predict off-property concentrations resulting from emissions of air pollution. Equations and algorithms representing atmospheric processes are incorporated into various computer models, which enable the modeler to enter pertinent data, such as emission rates and distance parameters. The model calculates atmospheric concentrations of a pollutant at specific points, or receptors, near the source(s) being evaluated.

Most state environmental agencies require some degree of modeling analysis as part of the air permit application process. It is important to determine the level of air pollution concentrations from an emissions source in order to evaluate the effect those emissions will have on the air quality in the vicinity of the source. Agency staff use modeling results to determine whether a facility is operating or will operate in compliance with state and federal standards, and whether its operation may result in negative health effects on persons living or working in the area.

ARGENT’S APPROACH

Argent uses EPA’s most current version of Air Dispersion Models and a graphical software package to perform refined air dispersion modeling. Our approach to modeling consists of (1) collecting all needed information about the facility, such as point parameters, exact location, and emission rates, to produce the most accurate results; (2) performing preliminary modeling to determine whether refined modeling is required; (3) if necessary, performing a refined modeling analysis according to the guidelines of the state in which the facility is located; and (4) producing a finished report for the environmental agency or agencies and for the client. Argent has successfully performed refined modeling in several states for various types of facilities.