Air Quality Modeling Services

Photochemical
Meteorological
Deposition
Air Toxic Emissions
Model Development
Complex Terrain Applications

Air quality models are used to describe how pollutants emitted into the air are transported downwind and to predict the ground level concentrations of the pollutants. It is difficult to accurately predict downwind concentrations because the nature of air movement is very complex. Heating and cooling of the air, obstacles such as buildings or hills that have to be negotiated by the air, and chemical reactions for pollutants such as ozone or acid rain, all add layers of complexity.

TRC air quality scientists are internationally recognized experts in the area of air quality modeling and model development. They have developed or enhanced many widely-used air quality and meteorological models, including CALPUFF, CALMET, CALGRID, BLP, ISC3 (downwash and deposition), CTDMPLUS, OCD, and KSP. Several of these models have been accepted by the US EPA as 'Guideline' models recommended for regulatory use. Our scientists have published numerous journal articles and books, conducted modeling workshops, and participated in scientific conferences worldwide.

This position at the leading edge of modeling and scientific technology enables us to assist clients find cost-effective solutions to today's complex environmental issues. Many companies can apply routine air modeling techniques, but few, if any, can match our skills in developing, refining, and customizing models to meet client needs.

TRC scientists have pioneered complex modeling issues such as: regional scale transport and dispersion, photochemical modeling, complex terrain effects, aerodynamic effects of buildings and other structures, toxic pollutant dispersion and deposition, and accidental release of dense gases.