Air Modeling Services

Dispersion Modeling

Exposure Assessment

Air Permitting

Urban Air Assessment

Risk Management Planning

Specialty Studies


Air Monitoring Services

Air Sampling

Wind/Met Data Acquisition

Odor Sampling

Flux Studies

Noise Monitoring




Company Overview


Sullivan Environmental Consulting, Inc. provides air quality modeling and air monitoring services to various industries, organizations, and government agencies. Located in the Washington, DC area, Sullivan Environmental provides a wide range of air quality consulting services nationwide and in some cases internationally, with dispersion modeling (ISCST3, CALPUFF, AERMOD, FEMS, PERFUM, and TOXST) and air sampling (particulates, gases, various organic and inorganic compounds) serving as their primary specializations.

Specialization also includes the development of innovative modeling methods and software, including accident and emergency analysis, and Monte Carlo modeling methods. The firm has extensive experience in urban-scale modeling including studies in the U.S., Eastern Europe, and Southeast Asia. Sullivan Environmental, located near Washington DC in Alexandria, Virginia, is in its 25th year of operation.

Sullivan Environmental offers the stability of a firm that has been located at the same address and phone number since 1988, and will be here to meet your needs in the future. Operating as a small, specialty contractor, our company provides clients with the security of using highly experienced analysts. Certified Consulting Meteorologists David Sullivan and Dennis Hlinka have approximately 75 years of combined professional experience, and have managed many of the U.S. Environmental Protection Agency’s largest studies of toxic air pollution in the U.S. and in Eastern Europe.

History of the Company

Incorporated in 1985 as a Virginia Corporation, Sullivan Environmental opened its doors for business in January of 1988. From 1988 through the present time, the firm has been located at 1900 Elkin Street, Alexandria, VA 22308. This location is approximately one-half hour from the nation’s capital.

During the 1980s and early 1990s, Sullivan Environmental served primarily as an EPA contractor. Our staff was responsible for managing and conducting approximately 10 urban-scale air quality studies, with eight of these studies in U.S. metropolitan areas and three studies in Eastern Europe (Russia, Czech Republic, and Poland).

In 1987 and 1988, the staff of Sullivan Environmental provided extensive modeling support to the EPA Office of Solid Waste. This project was focused on evaluating exposures to metal releases from incineration. Modeling was conducted in 30 areas throughout the U.S. and methodology was developed to support EPA’s efforts in this area.

In 1989 during the EPA Kanawha Valley Study of Air Toxics, Sullivan Environmental developed the first prototype version of what eventually was named the EPA TOXST model, which employed Monte Carlo methods to more realistically model acute exposures. Mr. Sullivan and Mr. Hlinka also were the principal analysts for the study initiated by the EPA Administrator, Lee Thomas, subsequent to the Bhopal tragedy in India. The primary area of that review was a cancer risk assessment associated with the major chemical industries in the Kanawha Valley of West Virginia (Charleston area).

During the mid-1990s, Sullivan Environmental was retained by Allegheny County, Pennsylvania (Pittsburgh), to provide assistance in the development of a State Implementation Plan (SIP) for coke oven operations in Allegheny County. Support included conducting meteorological studies, software development, and modeling assistance. The SIP was approved as a model-based SIP for coke oven operations.

In 1993, Sullivan Environmental developed the current version of the EPA TOXST model. Our firm was retained by EPA after developing a successful prototype under contract to a major chemical manufacturing organization. This model provides the opportunity to reduce the degree of conservatism when modeling short-term exposures to air toxics from sources that emit on a variable or infrequent basis.

From 1997 to the present time, the firm has been heavily involved with evaluating and managing exposures associated with pesticide use in the agricultural setting. Our staff has been conducting numerous large scale field studies that are composed of air sampling, meteorological sampling and analysis, air modeling analyses, and evaluating measures to reduce exposures from the application of the agricultural fumigants (metam-sodium, chloropicrin, DMDS, furfural, methyl bromide, 1,3-dichloropropene, and others). This work has resulted in the identification of methods to substantially reduce off-gassing rates and exposures for the major alternatives to replace the widely used methyl bromide fumigant which is being phased out as an ozone depleting substance. Sullivan Environmental developed the monte carlo modeling system FEMS, which was approved by the EPA science Advisory Panel (SAP) to evaluate buffer zones.

Sullivan Environmental has provided modeling support to support air quality permits involving the chemical industry, hazardous waste incineration, a municipal incinerator, the cement industry, paint industry, iron & steel, smelters, mobile source-related impacts for major development projects, indirect exposure assessment for incineration impacts, and exposure assessment for numerous pesticide products. Permits included air quality permits to construct and Prevention of Significant Deterioration.

Throughout the operation of the firm, Sullivan Environmental has conducted specialty modeling of toxic and criteria air pollutants including airborne exposures and evaluation of deposition to the surface and soil contamination.

The resume of David Sullivan, President of Sullivan Environmental Consulting, Inc., is available through this link: Resume-PDF

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