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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 APIDYING83PM2.5 Open Data PortalHEALTHY91
Uptime · 30d
Uptime · 90d84.3%100%
Uptime · 30d73.3%100%
P50 · ms575796
P95 · ms10681352
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 84.3% versus PM2.5 Open Data Portal at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

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

NDBC Buoy Data API has the lower median latency in our checks — NDBC Buoy Data API responds in 575 ms versus PM2.5 Open Data Portal at 796 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

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.