The commonly used advanced air dispersion models are AERMOD and CALPUFF.  Advanced air dispersion modelling exercises using these models are typically required to demonstrate compliance when applying for an Environmental Compliance Approval (ECA) for facilities with NAICS codes under Schedules 4 and 5 of Ontario Regulation 419/05 (Reg.419) and for facilities that wish to use Schedule 3 standards as specified in Reg. 419; and to support air quality impact assessments.


Our team has an in-depth knowledge of the complex model source codes which allows us to have a solid understanding of the strengths and weaknesses of the computer interface, and to optimize the model set up and run time. Further, our appreciation of the characteristics of different source types, impact of building downwash, meteorological conditions and terrain leads to practical air emission mitigation options to achieve environmental compliance and to reduce environmental impacts when required.

BCX's modelling team provides expertise in the application of the following air dispersion models in support of ECA applications, air impact assessments and other special source studies such as road and odour: 

- O.Reg.346 Model

- Screen 3


- ASHRAE (Self-Contamination)

- ISCST3, ISC-Prime




Services & Sectors

Services - Air DiSpersion MOdelling