The Emissions Factor consolidates key United States data sources—including eGRID and the Waste Reduction Model (WARM)—into a single, easy-to-use set of emission factors. Roughly 80% of American companies use the Hub for measuring and reporting scope 1 emissions.

The last version of the Hub was released in January 2025 by the US Environmental Protection Agency Center for Corporate Climate Leadership.

The 2026 edition of the GHG Emission Factors Hub builds on previous versions released by the EPA. This update includes eGRID factors; air travel factors for Category 6: Business Travel and Category 7: Employee Commuting; and updated refrigerant blends and GWPs to align with IPCC AR6.

WSP in the US and ERG, the consultancies that maintained the Hub with the EPA, will continue their work under Cornerstone.

Developed by Cornerstone and WSP in the US.