An official website of the United States government.

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.

Air Emissions Modeling

2014 Version 7.1 Platform

The 2014v7.1 platform is based on the 2014 NEI version 2. The platform supported modeling for the 2014 National Air Toxics Assessment (NATA). This platform is provided to aid interested parties in getting started with 2014NEI-based modeling.