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Due to a lapse in appropriations, EPA websites will not be regularly updated. In the event of an environmental emergency imminently threatening the safety of human life or where necessary to protect certain property, the EPA website will be updated with appropriate information. Please note that all information on the EPA website may not be up to date, and transactions and inquiries submitted to the EPA website may not be processed or responded to until appropriations are enacted.

We've made some changes to If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Resources for Understanding and Preparing Economic Analyses to Address Air Quality Regulations

The following links are useful for understanding and preparing economic analyses to address air quality regulations. Some of the links below relate to guidance or requirements for the analyses. Other links provide access to data needed for economic analyses.

Government – U.S. EPA Links

Government – non U.S. EPA Links

Executive Orders and Statutes

Emission Projection Tools and Data

EPA has retired the Economic Growth Analysis System version 5.0 (EGAS 5.0) software tool as of July, 2013. EPA provides projected emissions data on the Air Emissions Modeling website. As part of the Air Emissions Modeling Platforms, this site contains projected emissions data for select years modeled as part of EPA rules and Regulatory Impact Assessments (RIAs). These projected emissions data can provide a starting point for state air quality management agencies and other organizations to use for other purposes. Please refer to the Air Emissions Modeling website for the latest information on emissions projections.

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