emission-factors.com ("the Service") provides a REST API that returns US electricity emission factors derived from EPA eGRID data, mapped to ZIP codes. The Service is operated by an independent developer and is not affiliated with, endorsed by, or operated by the US Environmental Protection Agency.
Emission factors are sourced from EPA eGRID2023 Revision 2 (released June 12, 2025). We validate data integrity on every deployment by checking golden subregion values against EPA Table 1. However:
Exceeding your rate limit returns HTTP 429. The retryAfter field in the response body indicates when your window resets.
We aim for high availability but do not offer a formal SLA. The Service may be temporarily unavailable during deployments or infrastructure maintenance. We are not liable for downtime, data loss, or any damages arising from use of the Service.
We may suspend or terminate API keys that violate these terms. You may delete your account at any time by emailing us.
The Service is provided "as is" without warranties of any kind. In no event shall the operator be liable for any indirect, incidental, special, or consequential damages arising from use of the Service, including but not limited to incorrect emission calculations, regulatory penalties, or business losses.
We may update these terms. Continued use of the Service after changes constitutes acceptance.