Support Center for Regulatory Atmospheric Modeling (SCRAM)

This website provides access to air quality models and other mathematical simulation techniques used in assessing control strategies and source impacts. 

• Air Quality Models

  Air quality models use mathematical and numerical techniques to simulate the physical and chemical processes that affect air pollutants as they disperse and react in the atmosphere.

  Explore air quality models

• Model Applications and Tools

  EPA conducts modeling analyses to support policy and regulatory decisions using the full range of air quality models and other mathematical simulation techniques used in assessing control strategies and source culpability.

  Find the tools

• Modeling Guidance and Support

  EPA provides guidance and support to State/local/tribal agencies on the selection and use of models in regulatory settings.

  Get guidance

• Meteorological Data and Processors

  Air quality models solve for the change in pollutant concentrations over time and space, and thereby require certain meteorological inputs that, in part, determine the formation, transport, and destruction of pollutant material. 

  Use meteorological models

• Conferences and Workshops

  EPA sponsors a regular series of air quality model/modeling conferences and workshops and also periodically participates in other air quality modeling or related meetings. 

  Review the materials

• Reports and Journals

  Technical EPA modeling staff conduct modeling analyses to support policy and regulatory decisions and also coordinate with others in the modeling community on the development of new models and techniques. 

  Read the reports