| BreezoMeter Pollen | Daily forecast of pollen conditions and allergy data for specific locations | apiKey | ✓ | ? | |
| Carbon Interface | Calculate CO₂ emissions estimates for various carbon-emitting activities | apiKey | ✓ | ✓ | |
| Climatiq | Estimate the environmental footprint for a wide range of emission-generating activities | apiKey | ✓ | ✓ | |
| Cloverly | Calculate and offset the environmental impact of carbon-intensive activities in real time | apiKey | ✓ | ? | |
| CO2 Offset | Calculate and validate the carbon footprint for activities and offset tracking | No | ✓ | ? | |
| Danish Data Service Energi | Access open energy data from Denmark’s Energinet for sustainability insights | No | ✓ | ? | |
| GrünstromIndex | Green Power Index (Grünstromindex) for Germany, showing renewable energy share in the grid | No | ✗ | ✓ | |
| IQAir | Global air quality and weather monitoring data API | apiKey | ✓ | ? | |
| Luchtmeetnet | Real-time and forecasted air quality components for The Netherlands (RIVM data) | No | ✓ | ? | |
| National Grid ESO | Open electricity and energy system data from Great Britain's National Grid ESO | No | ✓ | ? | |
| OpenAQ | Access open global air quality data aggregated from various sources | apiKey | ✓ | ? | |
| PM2.5 Open Data Portal | Retrieve data from open low-cost PM2.5 air quality sensors worldwide | No | ✓ | ? | |
| PM25.in | Access real-time air quality data across China | apiKey | ✗ | ? | |
| PVWatts | Estimate energy production of photovoltaic (PV) systems based on location and configuration | apiKey | ✓ | ? | |
| Srp Energy | Retrieve hourly energy usage reports for SRP customers | apiKey | ✓ | ✗ | |
| UK Carbon Intensity | Official Carbon Intensity API for Great Britain, tracking electricity generation emissions | No | ✓ | ? | |
| Website Carbon | Estimate the carbon footprint of loading and hosting web pages | No | ✓ | ? | |