Estimating the impact of emissions from a facility normally involves the use of approved models of dispersion and modelling protocols. Our thorough knowledge of the atmospheric processes which drive dispersion paired with an in-depth understanding of the details of model behaviour allow us to custom design or alter source configurations to satisfy regulatory criteria. Our expertise includes application of the following models:

• EPA Gaussian models of AERMOD and its predecessors
• CALMET and CALPUFF models
• California roadway dispersion models
• heavy gas models such as DEGADIS
• grid models of meteorology and transport

Most of these complex modelling exercises require site specific meteorological data. We have extensive knowledge of the meteorological databases and NWP grid point data and the tools to prepare site-specific meteorological files for AERMOD and CALPUFF, and to obtain regulatory approval for the use of the site-specific data. We have also developed rapidAER, a modelling interface to AERMOD and a unique implementation of the AERMOD model which takes a fraction of the time to perform the extensive modelling required by regulations, and greatly facilitates the process of source configuration design.