Modeling Tips

AERMOD View - Concentration File Maker Utility

The AERMOD air dispersion model allows users to input time-varying concentration data to represent background sources to be added to the model’s calculations. This can be done by directly adding background concentrations to modeled pollutant concentrations or, in the case of nitrogen dioxide (NO₂), by adding background ozone or NO_x concentrations to assist in estimating how much NO₂ is formed through chemical transformation.

CALPUFF View - Defining Receptors in CALPOST

The CALPUFF model allows users to specify receptors in two different formats:

1. Gridded Receptors are defined as the Sampling Grid in which receptor locations are defined by the Meteorological Grid dimensions and extents.
2. Discrete Receptors are located based on user-defined coordinates for each individual receptor.

AERSCREEN View - Understanding AERSCREEN Results

The AERSCREEN model estimates worst-case impacts of ground-level concentrations for a single source by interfacing with the screening mode built into the AERMOD executable. AERSCREEN produces several different output files which can be assessed and analyzed using the advanced output viewer of Lakes Software’s AERSCREEN View application.