Carbon Interface
API to calculate carbon (C02) emissions estimates for common C02 emitting activities
Calculate the environmental footprint created by a broad range of emission-generating activities.
Climatiq API is a free Environment API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.
A complete data toolkit to guide your company’s journey to net-zero.
Details from docs.climatiq.io.

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API to calculate carbon (C02) emissions estimates for common C02 emitting activities
US EPA air quality data and forecasts
The Climatiq API is provided by Climatiq API Reference (docs.climatiq.io). A complete data toolkit to guide your company’s journey to net-zero.
Yes. The Climatiq API is listed in the Environment category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The Climatiq API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The Climatiq API supports CORS, so front-end JavaScript can call it directly.
Yes. The Climatiq API is served over HTTPS, so it's safe to use in production.