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PM2.5 Open Data Portal vs Storm Glass Marine Weather

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

APIPM2.5 Open Data PortalHEALTHY91Storm Glass Marine WeatherHEALTHY98
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms796238
P95 · ms13522729
AuthnoneapiKey
CORSnoyes
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 Storm Glass Marine Weather: common questions

Which is more reliable, PM2.5 Open Data Portal or Storm Glass Marine Weather?

Both are neck-and-neck — PM2.5 Open Data Portal and Storm Glass Marine Weather each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, PM2.5 Open Data Portal or Storm Glass Marine Weather?

Storm Glass Marine Weather has the lower median latency in our checks — PM2.5 Open Data Portal responds in 796 ms versus Storm Glass Marine Weather at 238 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 PM2.5 Open Data Portal and Storm Glass Marine Weather need an API key?

PM2.5 Open Data Portal needs no key, while Storm Glass Marine Weather 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 Storm Glass Marine Weather from the browser?

Only Storm Glass Marine Weather 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 PM2.5 Open Data Portal and Storm Glass Marine Weather free for commercial use?

PM2.5 Open Data Portal has unclear commercial terms, and Storm Glass Marine Weather 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.