Environment – Free-tier APIs
26 Free-tier APIs in the category Environment. Free public web APIs that developers and AI agents can call. Entries come from the open public-apis list; each link was checked automatically (HTTP status) on the date shown, which says the site responded, not that the API is good.
AirNow
US EPA air quality data and forecasts
BreezoMeter Pollen
Daily Forecast pollen conditions data for a specific location
Carbon Interface
API to calculate carbon (C02) emissions estimates for common C02 emitting activities
Climatiq
Calculate the environmental footprint created by a broad range of emission-generating activities
CO2 Offset
API calculates and validates the carbon footprint
Danish data service Energi
Open energy data from Energinet to society
EIA Open Data
US energy statistics: electricity, petroleum, gas
GridHub
Live wholesale electricity prices and demand across 25 grid zones
GridVigil
Pressure scores, demand, generation mix and alerts for the 10 major U.S. power grids
GrünstromIndex
Green Power Index for Germany (Grünstromindex/GSI)
IQAir
Air quality and weather data
kanari
Real-time worldwide wildfire detections, water bomber tracking and open fire archive
Luchtmeetnet
Predicted and actual air quality components for The Netherlands (RIVM)
Mycelium
Corporate carbon emissions disclosures (scope 1, 2 and 3), company-reported and estimated
Open-Meteo
Free weather API for non-commercial use
OpenAQ
Open air quality data
PM2.5 Open Data Portal
Open low-cost PM2.5 sensor data
PVGIS
EU solar radiation and photovoltaic performance estimates
sensor.community
Community air quality sensor network data worldwide
Solematica
Compare Italian solar (photovoltaic) installer offers, energy prices (PUN/ARERA) and satellite roof data
Srp Energy
Hourly usage energy report for Srp customers
SustainMetrics
18,000+ GHG emission factors from DEFRA, EPA, ADEME, Ember
Sähkön hinta nyt
Finnish and Nordic day-ahead electricity spot prices (15-minute), cheapest hours
UK Carbon Intensity
The Official Carbon Intensity API for Great Britain developed by National Grid
WattFigure
US electricity rates by state, with appliance and EV charging running costs
Website Carbon
API to estimate the carbon footprint of loading web pages