Environment APIs

Environmental data and weather

17 APIs in this category
17
APIs listed
8
need no API key (47%)
3
CORS enabled (18%)
15
HTTPS (88%)

This directory lists 17 environment APIs. 1 of them require no API key and support CORS, so you can call them directly from browser JavaScript with no backend and no sign-up. Every entry shows whether it needs authentication, serves over HTTPS and allows cross-origin requests, so you can pick one that fits your stack before you read a single doc page.

Showing 17 of 17 APIs

BreezoMeter Pollen

Daily forecast of pollen conditions and allergy data for specific locations

Auth: apiKey HTTPS CORS: Unknown

Carbon Interface

Calculate CO₂ emissions estimates for various carbon-emitting activities

Auth: apiKey HTTPS CORS: Yes

Climatiq

Estimate the environmental footprint for a wide range of emission-generating activities

Auth: apiKey HTTPS CORS: Yes

Cloverly

Calculate and offset the environmental impact of carbon-intensive activities in real time

Auth: apiKey HTTPS CORS: Unknown

CO2 Offset

Calculate and validate the carbon footprint for activities and offset tracking

Auth: No HTTPS CORS: Unknown

Danish Data Service Energi

Access open energy data from Denmark’s Energinet for sustainability insights

Auth: No HTTPS CORS: Unknown

GrünstromIndex

Green Power Index (Grünstromindex) for Germany, showing renewable energy share in the grid

Auth: No HTTPS CORS: Yes

IQAir

Global air quality and weather monitoring data API

Auth: apiKey HTTPS CORS: Unknown

Luchtmeetnet

Real-time and forecasted air quality components for The Netherlands (RIVM data)

Auth: No HTTPS CORS: Unknown

National Grid ESO

Open electricity and energy system data from Great Britain's National Grid ESO

Auth: No HTTPS CORS: Unknown

OpenAQ

Access open global air quality data aggregated from various sources

Auth: apiKey HTTPS CORS: Unknown

PM2.5 Open Data Portal

Retrieve data from open low-cost PM2.5 air quality sensors worldwide

Auth: No HTTPS CORS: Unknown

PM25.in

Access real-time air quality data across China

Auth: apiKey HTTPS CORS: Unknown

PVWatts

Estimate energy production of photovoltaic (PV) systems based on location and configuration

Auth: apiKey HTTPS CORS: Unknown

Srp Energy

Retrieve hourly energy usage reports for SRP customers

Auth: apiKey HTTPS CORS: No

UK Carbon Intensity

Official Carbon Intensity API for Great Britain, tracking electricity generation emissions

Auth: No HTTPS CORS: Unknown

Website Carbon

Estimate the carbon footprint of loading and hosting web pages

Auth: No HTTPS CORS: Unknown

Best Environment and Weather APIs for Developers

An environment API allows developers to integrate weather forecasts, air quality data, climate records, and natural disaster alerts into their applications. These APIs serve outdoor apps, agricultural tools, energy management systems, and smart city platforms.

CodeHelper's curated environment API collection includes APIs covering weather forecasting, climate data, air quality monitoring, UV index, and natural event tracking.

What to look for in an environment API

  • Forecast horizon: Different APIs offer 3-day, 7-day, or 14-day forecasts; choose based on your application's needs.
  • Data resolution: Hyperlocal weather APIs provide grid-level data while global APIs offer city-level resolution.
  • Historical access: Climate analysis and backtesting require APIs with deep historical weather archives.

How to use this API directory

  1. Browse the curated list of APIs below.
  2. Click any API to visit its documentation.
  3. Check the Auth column to understand what credentials you need.

Whether you are building a weather app or an environmental monitoring dashboard, this free curated API directory saves you hours of research.

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