How to: Environment
API | Description | Auth | HTTPS | CORS |
|:---|:---|:---|:---|:---|
| [BreezoMeter Pollen](https://docs.breezometer.com/api-documentation/pollen-api/v2/) | Daily Forecast pollen conditions data for a specific location | `apiKey` | Yes | Unknown |
| [Carbon Interface](https://docs.carboninterface.com/) | API to calculate carbon (C02) emissions estimates for common C02 emitting activities | `apiKey` | Yes | Yes |
| [Climatiq](https://docs.climatiq.io) | Calculate the environmental footprint created by a broad range of emission-generating activities | `apiKey` | Yes | Yes |
| [Cloverly](https://www.cloverly.com/carbon-offset-documentation) | API calculates the impact of common carbon-intensive activities in real time | `apiKey` | Yes | Unknown |
| [CO2 Offset](https://co2offset.io/api.html) | API calculates and validates the carbon footprint | No | Yes | Unknown |
| [Danish data service Energi](https://www.energidataservice.dk/) | Open energy data from Energinet to society | No | Yes | Unknown |
| [GrünstromIndex](https://gruenstromindex.de/) | Green Power Index for Germany (Grünstromindex/GSI) | No | No | Yes |
| [IQAir](https://www.iqair.com/air-pollution-data-api) | Air quality and weather data | `apiKey` | Yes | Unknown |
| [Luchtmeetnet](https://api-docs.luchtmeetnet.nl/) | Predicted and actual air quality components for The Netherlands (RIVM) | No | Yes | Unknown |
| [National Grid ESO](https://data.nationalgrideso.com/) | Open data from Great Britain’s Electricity System Operator | No | Yes | Unknown |
| [OpenAQ](https://docs.openaq.org/) | Open air quality data | `apiKey` | Yes | Unknown |
| [PM2.5 Open Data Portal](https://pm25.lass-net.org/#apis) | Open low-cost PM2.5 sensor data | No | Yes | Unknown |
| [PM25.in](http://www.pm25.in/api_doc) | Air quality of China | `apiKey` | No | Unknown |
| [PVWatts](https://developer.nrel.gov/docs/solar/pvwatts/v6/) | Energy production photovoltaic (PV) energy systems | `apiKey` | Yes | Unknown |
| [Srp Energy](https://srpenergy-api-client-python.readthedocs.io/en/latest/api.html) | Hourly usage energy report for Srp customers | `apiKey` | Yes | No |
| [UK Carbon Intensity](https://carbon-intensity.github.io/api-definitions/#carbon-intensity-api-v1-0-0) | The Official Carbon Intensity API for Great Britain developed by National Grid | No | Yes | Unknown |
| [Website Carbon](https://api.websitecarbon.com/) | API to estimate the carbon footprint of loading web pages | No | Yes | Unknown |

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