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PM2.5 Open Data Portal vs Weatherstack

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

APIPM2.5 Open Data PortalNEW—WeatherstackNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — no API keyFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

PM2.5 Open Data Portal vs Weatherstack: common questions

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

On our scheduled checks, Weatherstack leads on measured uptime — PM2.5 Open Data Portal at —% versus Weatherstack 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 PM2.5 Open Data Portal and Weatherstack need an API key?

PM2.5 Open Data Portal needs no key, while Weatherstack requires a free API key. If you want to start calling without signup, reach for PM2.5 Open Data Portal first.

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

Neither sends browser-friendly CORS headers reliably, so call PM2.5 Open Data Portal and Weatherstack from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

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

PM2.5 Open Data Portal has unclear commercial terms, and Weatherstack 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.