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PM2.5 Open Data Portal vs Sunrise-Sunset

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

APIPM2.5 Open Data PortalHEALTHY91Sunrise-SunsetHEALTHY97
Uptime · 30d
Uptime · 90d100%99.02%
Uptime · 30d100%98.3%
P50 · ms796204
P95 · ms13522206
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedn/a
Free tierFree — no API keyUnlimited, attribution requested
Rate limitUnpublishedNo burst traffic
In directory since2026-07-052026-06-22
operationalpartialdownno data

PM2.5 Open Data Portal vs Sunrise-Sunset: common questions

Which is more reliable, PM2.5 Open Data Portal or Sunrise-Sunset?

On our scheduled checks, PM2.5 Open Data Portal leads on measured uptime — PM2.5 Open Data Portal at 100% versus Sunrise-Sunset at 99.02% 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, PM2.5 Open Data Portal or Sunrise-Sunset?

Sunrise-Sunset has the lower median latency in our checks — PM2.5 Open Data Portal responds in 796 ms versus Sunrise-Sunset at 204 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 Sunrise-Sunset need an API key?

Neither needs a paid key — PM2.5 Open Data Portal is callable with no signup, and Sunrise-Sunset is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call PM2.5 Open Data Portal and Sunrise-Sunset from the browser?

Only Sunrise-Sunset 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 Sunrise-Sunset free for commercial use?

PM2.5 Open Data Portal has unclear commercial terms, and Sunrise-Sunset 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.