Environmental APIs provide data on air quality, pollution levels, carbon emissions, and ecological metrics. Build sustainability dashboards, environmental monitoring tools, or green energy applications.
Last verified: November 12, 2026
| Name | Description | Auth | HTTPS | CORS | Uptime (30 days) |
|---|---|---|---|---|---|
| 1ClickImpact | Environmental impact API for tree planting, carbon offsetting and ocean cleanup | apikey | Yes | yes | 100% (5 checks) |
| AirNow | US EPA air quality data and forecasts | apikey | Yes | yes | 100% (5 checks) |
| BreezoMeter Pollen | Daily Forecast pollen conditions data for a specific location | apikey | Yes | unknown | 100% (5 checks) |
| Calendrier Tempo | French EDF Tempo tariff: today's and tomorrow's colour, kWh prices and 15-day colour forecasts | none | Yes | yes | 100% (5 checks) |
| Carbon Interface | API to calculate carbon (C02) emissions estimates for common C02 emitting activities | apikey | Yes | yes | 100% (5 checks) |
| Climatiq | Calculate the environmental footprint created by a broad range of emission-generating activities | apikey | Yes | yes | 100% (5 checks) |
| Cloverly | API calculates the impact of common carbon-intensive activities in real time | apikey | Yes | unknown | 80.0% (5 checks) |
| CO2 Offset | API calculates and validates the carbon footprint | none | Yes | unknown | 100% (5 checks) |
| EIA Open Data | US energy statistics: electricity, petroleum, gas | apikey | Yes | unknown | 100% (5 checks) |
| El mapa del agua | Water hardness (°fH) of Spanish municipalities by INE code or postal code, with the source and date of each analysis | none | Yes | yes | 100% (5 checks) |
| Elpriser i dag | Swedish electricity spot prices including VAT and energy tax, in 15-minute intervals | none | Yes | yes | 100% (5 checks) |
| GridHub | Live wholesale electricity prices and demand across 25 grid zones | apikey | Yes | yes | 100% (5 checks) |
| GridVigil | Pressure scores, demand, generation mix and alerts for the 10 major U.S. power grids | none | Yes | yes | 100% (5 checks) |
| IQAir | Air quality and weather data | apikey | Yes | unknown | 100% (5 checks) |
| kanari | Real-time worldwide wildfire detections, water bomber tracking and open fire archive | none | Yes | yes | 100% (5 checks) |
| Luchtmeetnet | Predicted and actual air quality components for The Netherlands (RIVM) | none | Yes | unknown | 100% (5 checks) |
| OpenAQ | Open air quality data | apikey | Yes | unknown | 100% (5 checks) |
| PixelGust Soil | Soil properties at 6 depths for any point (SoilGrids 2.0, 250 m), ISRIC-compatible | none | Yes | yes | 100% (1 check) |
| PM2.5 Open Data Portal | Open low-cost PM2.5 sensor data | none | Yes | unknown | 100% (5 checks) |
| PVGIS | EU solar radiation and photovoltaic performance estimates | none | Yes | no | 100% (5 checks) |
| PVWatts | Energy production photovoltaic (PV) energy systems | apikey | Yes | unknown | 80.0% (5 checks) |
| sensor.community | Community air quality sensor network data worldwide | user-agent | Yes | yes | 100% (5 checks) |
| Smartatest | Calculators for home energy cost, lighting, air quality limits and GS1 barcode prefixes, in Swedish | none | Yes | yes | 100% (5 checks) |
| SoilPoint | US soil properties at a lat/lon from USDA SSURGO: texture, drainage, pH, organic matter | none | Yes | no | 100% (5 checks) |
| Solematica | Compare Italian solar (photovoltaic) installer offers, energy prices (PUN/ARERA) and satellite roof data | none | Yes | no | 100% (5 checks) |
| SpotWave | Day-ahead electricity prices for 40+ European market zones, incl. taxes and VAT | none | Yes | yes | 100% (5 checks) |
| Srp Energy | Hourly usage energy report for Srp customers | apikey | Yes | no | 100% (5 checks) |
| Strømpriser i dag | Norwegian electricity prices including VAT and the state subsidy, plus grid tariffs for all 73 grid companies | none | Yes | yes | 100% (5 checks) |
| SustainMetrics | 18,000+ GHG emission factors from DEFRA, EPA, ADEME, Ember | apikey | Yes | yes | 100% (5 checks) |
| Sähkön hinta nyt | Finnish and Nordic day-ahead electricity spot prices (15-minute), cheapest hours | none | Yes | yes | 100% (5 checks) |
| UK Carbon Intensity | The Official Carbon Intensity API for Great Britain developed by National Grid | none | Yes | unknown | 100% (5 checks) |
| USGS Water Services | Real-time and historical river flow, water level and water quality readings from thousands of US Geological Survey monitoring sites. | none | Yes | yes | 100% (3 checks) |
| WattBuy | Electricity usage estimations, carbon footprint estimations, and utility data | apikey | Yes | yes | 100% (5 checks) |
| WattFigure | US electricity rates by state, with appliance and EV charging running costs | none | Yes | yes | 100% (5 checks) |
| Website Carbon | API to estimate the carbon footprint of loading web pages | none | Yes | unknown | 100% (5 checks) |
20 of these APIs require no authentication — you can start making requests immediately without signing up for an account. Just pick one from the table above, check its documentation, and send your first request.
14 APIs in this category require a free API key. This usually means creating a free account on the provider's website and copying your key from the dashboard. The process typically takes less than a minute.
Not sure where to start? Check the uptime column: it shows how often each API's documentation responded to our daily checks over the last 30 days, and the dot shows whether it responded at the latest check. For browser-based projects, check that the API supports CORS.
Yes, all APIs listed on API Bouncer have a free tier. Some are completely open (no sign-up needed), while others require a free account to get an API key. Free tiers typically have rate limits — check each API's documentation for specifics.
It depends on your needs. Consider: Do you need authentication or prefer no-auth? Does your project need CORS support for browser access? How many requests will you make? Start with a no-auth API to prototype quickly, then switch to a more feature-rich option if needed.
We run periodic health checks on all listed APIs. The "Status" column shows whether each API was responding at our last check. APIs marked as "alive" were recently verified. You can also test any API yourself using curl or our guides on testing APIs.
Most free APIs allow commercial use, but terms vary by provider. Always check the specific API's terms of service. Some APIs have separate free and commercial tiers with different rate limits.
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