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NDBC Buoy Data API vs PM2.5 Open Data Portal

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

APINDBC Buoy Data APINEW—PM2.5 Open Data PortalNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — no API key
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

NDBC Buoy Data API vs PM2.5 Open Data Portal: common questions

Which is more reliable, NDBC Buoy Data API or PM2.5 Open Data Portal?

On our scheduled checks, PM2.5 Open Data Portal leads on measured uptime — NDBC Buoy Data API 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 NDBC Buoy Data API and PM2.5 Open Data Portal need an API key?

Neither needs a paid key — NDBC Buoy Data API 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 NDBC Buoy Data API and PM2.5 Open Data Portal from the browser?

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

Are NDBC Buoy Data API and PM2.5 Open Data Portal free for commercial use?

NDBC Buoy Data API 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.