GHG Emission Factors Hub

EPA's GHG Emission Factors Hub was designed to provide organizations with a regularly updated and easy-to-use set of default emission factors for organizational greenhouse gas reporting. Key sources for emission factors include:

• EPA's Greenhouse Gas Reporting Program
• EPA's Emissions & Generation Resource Integrated Database (eGRID)
• Inventory of U.S. Greenhouse Gas Emissions and Sinks
• EPA's Waste Reduction Model (WARM)
• Intergovernmental Panel on Climate Change (IPCC), Fifth Assessment Report (AR5)

The most recent version of the Emission Factors Hub (February 2024) includes updates to global warming potentials (to align with IPCC’s Fifth Assessment), and emission factors for purchased electricity (from eGRID), mobile combustion, upstream and downstream transportation, business travel, product transport, and employee commuting.

Download the latest version of the Emission Factors Hub as well as previous versions in the table below. Guidance on the use of EPA's Emission Factors Hub's waste emission factors versus the Waste Reduction Model (WARM) is also available.