Environment APIs let you add environment capabilities without building from scratch. Every entry below is profiled with trust signals — pricing model, authentication requirements, CORS support, rate limits, and live uptime checks — so you can compare options and pick production-safe choices instead of guessing from a link list.
| API | Pricing | Auth | CORS | Health | |
|---|---|---|---|---|---|
| 1ClickImpact Environmental impact API for tree planting, carbon offsetting and ocean cleanup | Free | API Key | No | Profile | |
| BreezoMeter Pollen Daily Forecast pollen conditions data for a specific location | Free | API Key | No | Profile | |
| CO2 Offset API API calculates and validates the carbon footprint | Unknown | Unknown | Unknown | Profile | |
| Carbon Interface API to calculate carbon (C02) emissions estimates for common C02 emitting activities | Free | API Key | Yes | Profile | |
| Carbon Interface API Carbon Interface API: calculate carbon emissions for flights, vehicles, energy, and shipping. | Freemium | Unknown | Yes | Profile | |
| Climate TRACE API Climate TRACE API: global emissions data from satellite-derived measurements for countries and sectors. | Free | Unknown | Yes | Profile | |
| Climatiq Calculate the environmental footprint created by a broad range of emission-generating activities | Free | API Key | Yes | Profile | |
| Cloverly API calculates the impact of common carbon-intensive activities in real time | Free | API Key | No | Profile | |
| Danish data service Energi Open energy data from Energinet to society | Free | No | No | Profile | |
| Ducks Unlimited API explorer that gives a query URL with a JSON response of locations and cities | Freemium | No | No | Profile | |
| Electricity Maps API Electricity Maps API: real-time carbon intensity of electricity grids worldwide, zone-level data, forecasts, and historical trends. | Freemium | API Key | Yes | Profile | |
| GrünstromIndex Green Power Index for Germany (Grünstromindex/GSI) | Free | No | Yes | Profile | |
| IQAir Air quality and weather data | Free | API Key | No | Profile | |
| IQAir AirVisual API IQAir AirVisual API for real-time air quality data, forecasts, and historical AQI from global monitoring stations with 72-hour predictions. | Freemium | Unknown | No | Profile | |
| Luchtmeetnet Predicted and actual air quality components for The Netherlands (RIVM) | Free | No | Yes | Profile | |
| National Grid ESO Open data from Great Britain’s Electricity System Operator | Free | No | Yes | Profile | |
| OpenAQ Open air quality data | Free | API Key | Yes | Profile | |
| PM2.5 Open Data Portal Open low-cost PM2.5 sensor data | Free | No | No | Profile | |
| PM25.in API Air quality of China | Unknown | API Key | Unknown | Profile | |
| PVWatts Energy production photovoltaic (PV) energy systems | Free | API Key | Yes | Profile | |
| PurpleAir Real-time air quality sensor data from the PurpleAir community network. | Free | No | No | Profile | |
| Solematica API Compare Italian solar (photovoltaic) installer offers, energy prices (PUN/ARERA) and satellite roof data | Paid | API Key | No | Profile | |
| Srp Energy Hourly usage energy report for Srp customers | Freemium | API Key | Yes | Profile | |
| SustainMetrics API 18,000+ GHG emission factors from DEFRA, EPA, ADEME, Ember | Freemium | API Key | Yes | Profile | |
| Thames Water Open Data Open Data from the UK's largest water and wastewater services company | Free | API Key | No | Profile | |
| UK Carbon Intensity The Official Carbon Intensity API for Great Britain developed by National Grid | Free | No | Yes | Profile | |
| WattBuy Electricity usage estimations, carbon footprint estimations, and utility data | Freemium | API Key | No | Profile | |
| Website Carbon API to estimate the carbon footprint of loading web pages | Free | No | No | Profile | |
| kanari API Real-time worldwide wildfire detections, water bomber tracking and open fire archive | Paid | Unknown | Yes | Profile |
Start with pricing and auth: free tiers and no-auth APIs are fastest to prototype with. Then check CORS if your app calls the API from the browser, and health before you commit — a great API that's been down for a week will block your launch. Each profile below shows all of these signals plus rate limits where documented.