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PM25.in API alternatives

Air quality of China. A free environment API by pm25.in. If it doesn't fit your project, here are the 10 best free Environment APIs to use instead in 2026, out of 29 in the directory.

For reference, PM25.in API: Fast: 395 ms response.

  1. 1kanari logo

    kanari API

    Online · 527 ms

    Real-time worldwide wildfire detections, water bomber tracking and open fire archive.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  2. 2Open-Meteo logo

    Open-Meteo API

    Online · 609 ms

    Free weather API for non-commercial use.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  3. 3Sähkön hinta nyt logo

    Sähkön hinta nyt API

    Online · 1106 ms

    Finnish and Nordic day-ahead electricity spot prices (15-minute), cheapest hours.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  4. 4

    WattFigure API

    Online · 712 ms

    US electricity rates by state, with appliance and EV charging running costs.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  5. 5Carbon Interface logo

    Carbon Interface API

    Online · 873 ms

    API to calculate carbon (C02) emissions estimates for common C02 emitting activities.

    • Callable from the browser (CORS)
    • HTTPS
    apiKeyHTTPSCORS
  6. 6Danish data service Energi logo

    Danish data service Energi API

    Online · 867 ms

    Open energy data from Energinet to society.

    • No API key needed
    • HTTPS
    No authHTTPSCORS ?
  7. 7GridHub logo

    GridHub API

    Online · 767 ms

    Live wholesale electricity prices and demand across 25 grid zones.

    • Callable from the browser (CORS)
    • HTTPS
    apiKeyHTTPSCORS
  8. 8GridVigil logo

    GridVigil API

    Online · 1588 ms

    Pressure scores, demand, generation mix and alerts for the 10 major U.S. power grids.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  9. 9SustainMetrics logo

    SustainMetrics API

    Online · 697 ms

    18,000+ GHG emission factors from DEFRA, EPA, ADEME, Ember.

    • Callable from the browser (CORS)
    • HTTPS
    apiKeyHTTPSCORS
  10. 10UK Carbon Intensity logo

    UK Carbon Intensity API

    Online · 869 ms

    The Official Carbon Intensity API for Great Britain developed by National Grid.

    • No API key needed
    • HTTPS
    No authHTTPSCORS ?

PM25.in API vs alternatives

PM25.in API compared with its alternatives
APIAPI keyHTTPSCORSUptimeResponseRating
PM25.inRequiredNoUnknownUp395 msNot rated
kanari logokanariNoYesYesUp527 msNot rated
Open-Meteo logoOpen-MeteoNoYesYesUp609 msNot rated
Sähkön hinta nyt logoSähkön hinta nytNoYesYesUp1106 msNot rated
WattFigureNoYesYesUp712 msNot rated
Carbon Interface logoCarbon InterfaceRequiredYesYesUp873 msNot rated
Danish data service Energi logoDanish data service EnergiNoYesUnknownUp867 msNot rated
GridHub logoGridHubRequiredYesYesUp767 msNot rated
GridVigil logoGridVigilNoYesYesUp1588 msNot rated

See also: best Environment APIs · all Environment APIs

PM25.in API alternatives FAQ

What is the best free alternative to the PM25.in API in 2026?

The top-ranked free alternatives to the PM25.in API are kanari API, Open-Meteo API and Sähkön hinta nyt API, all in the Environment category. Rankings combine access (API key, HTTPS, CORS), daily uptime checks and developer ratings.

Is there a PM25.in API alternative that doesn't need an API key?

Yes: kanari API, Open-Meteo API and Sähkön hinta nyt API work without an API key, unlike the PM25.in API, which uses apiKey authentication.

Is there a PM25.in API alternative I can call from the browser?

kanari API, Open-Meteo API and Sähkön hinta nyt API support CORS, so front-end JavaScript can call them directly.

How many Environment APIs are similar to the PM25.in API?

The directory lists 29 other free Environment APIs. This page compares the top ones side by side.