An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

EPA Center for Corporate Climate Leadership

GHG Emission Factors Hub

This document was designed to provide organizations with a regularly updated and easy-to-use set of default emission factors for organizational greenhouse gas reporting. The document includes updated emission factors collated from both EPA's Greenhouse Gas Reporting Program and the Center's technical guidance. The most recent version of the Emission Factors Hub (March 2020) includes updates to emission factors for onsite, mobile combustion, and other factors derived from the US GHG Inventory; business travel and product transport; and purchased electricity from EPA's Emissions & Generation Resource Integrated Database (eGRID). It also includes new emission factors for waste from onsite generation and use of sold products. Guidance on the use of EPA’s Emission Factors Hub’s waste emission factors versus the Waste Reduction Model (WARM) is also available.

Download as an Excel file: GHG Emission Factors Hub(553 K, March 2020)

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.