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Bright Sky (DWD) vs PM2.5 Open Data Portal

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

APIBright Sky (DWD)NEW—PM2.5 Open Data PortalNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierUnlimited, no key, no credit cardFree — no API key
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Bright Sky (DWD) vs PM2.5 Open Data Portal: common questions

Which is more reliable, Bright Sky (DWD) or PM2.5 Open Data Portal?

On our scheduled checks, PM2.5 Open Data Portal leads on measured uptime — Bright Sky (DWD) 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 Bright Sky (DWD) and PM2.5 Open Data Portal need an API key?

Neither needs a paid key — Bright Sky (DWD) 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 Bright Sky (DWD) and PM2.5 Open Data Portal from the browser?

Only Bright Sky (DWD) 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 Bright Sky (DWD) and PM2.5 Open Data Portal free for commercial use?

Bright Sky (DWD) has unclear commercial terms, 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.