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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 PortalNEW—Storm Glass Marine WeatherNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
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?

On our scheduled checks, Storm Glass Marine Weather leads on measured uptime — PM2.5 Open Data Portal at —% versus Storm Glass Marine Weather 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 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.