Atmospheric Dispersion Modeling Consulting Services

At Sullivan Environmental, we perform air dispersion modeling using tools like AERMOD and CALPUFF.  We also utilize ISCST3, CAL3QHC, TOXST, SLAB, and SCREEN3. Our experienced Atmospheric Dispersion Modeling team uses various meteorological and source processing programs for modeling, including PCRAMMET, BPIP, CALMET, CALPOST, AERMET, and others. 

These tools help adapt the modeling based on source types, weather data, and specific project needs.  Importantly, Sullivan Environmental creates various dispersion modeling programs, such as TOXST, the Fumigant Emissions Modeling System (FEMS), and the RISKMANpro ™ platform. 

The RISKMANpro ™ model evaluates emissions from accidental releases of dense gases.  This refines hazard zones for risk management programs (RMP), and other uses. Also, Sullivan Environmental conducts modeling for numerous sources related to toxic chemicals or EPA priority pollutant endpoints.  This includes power plants, municipal incinerators, industrial facilities, and agricultural pesticide emissions.   This includes mining waste, traffic, parking garages, quarries, gasoline transfer stations, bus depots, and truck loading docks.

Examples of Dispersion Modeling Projects include:

Accident analysis example: A barge carrying volatile organic chemicals collides with a bridge in a major city, leading to airborne emissions. The emissions assessment is part of this analysis, with isopleth analyses created to evaluate relative exposures.

Accident analysis design example: Sullivan Environmental receives a Small Business Innovative Research (SBIR) contract and designs a model to help the U.S. Air Force manage toxic materials, including rocket fuel. This model is based on SLAB accident analysis dispersion modeling.  The model provides isopleth analyses of outdoor conditions over time and identifies indoor concentrations.

Gas station impact analysis example: Other pollutants are modeled to evaluate air quality impacts in the area along with volatile organic compounds generated from gas pumping and idling vehicles.