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Open-Meteo vs PM2.5 Open Data Portal

Same instrument, two spec sheets — measured, not claimed.

APIOpen-MeteoHEALTHY—PM2.5 Open Data PortalNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial usenounclear
Data licenseCC-BY 4.0Unverified
Free tier<10,000 calls/day, no signupFree — no API key
Rate limit600/min · 5,000/hourUnpublished
In directory since2026-05-022026-07-05
operationalpartialdownno data

Open-Meteo vs PM2.5 Open Data Portal: common questions

Which is more reliable, Open-Meteo or PM2.5 Open Data Portal?

On our scheduled checks, PM2.5 Open Data Portal leads on measured uptime — Open-Meteo at —% versus PM2.5 Open Data Portal at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do Open-Meteo and PM2.5 Open Data Portal need an API key?

Neither needs a paid key — Open-Meteo is callable with no signup, and PM2.5 Open Data Portal is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Open-Meteo and PM2.5 Open Data Portal from the browser?

Only Open-Meteo is browser-friendly — it returns CORS headers over HTTPS. PM2.5 Open Data Portal needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Open-Meteo and PM2.5 Open Data Portal free for commercial use?

Open-Meteo is personal/non-commercial only, and PM2.5 Open Data Portal has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.