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PM2.5 Open Data Portal vs UK Carbon Intensity

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

APIPM2.5 Open Data PortalHEALTHY91UK Carbon IntensityHEALTHY70
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms796789
P95 · ms13521948
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedCC BY 4.0 (per API docs)
Free tierFree — no API keyFree — no API key
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

PM2.5 Open Data Portal vs UK Carbon Intensity: common questions

Which is more reliable, PM2.5 Open Data Portal or UK Carbon Intensity?

Both are neck-and-neck — PM2.5 Open Data Portal and UK Carbon Intensity 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 UK Carbon Intensity?

UK Carbon Intensity has the lower median latency in our checks — PM2.5 Open Data Portal responds in 796 ms versus UK Carbon Intensity at 789 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 UK Carbon Intensity need an API key?

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

Can I call PM2.5 Open Data Portal and UK Carbon Intensity from the browser?

Only UK Carbon Intensity 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 UK Carbon Intensity free for commercial use?

PM2.5 Open Data Portal has unclear commercial terms, and UK Carbon Intensity allows commercial use on its free tier. 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.