openSenseMap vs PM2.5 Open Data Portal
Same instrument, two spec sheets — measured, not claimed.
openSenseMap vs PM2.5 Open Data Portal: common questions
Which is more reliable, openSenseMap or PM2.5 Open Data Portal?
On our scheduled checks, PM2.5 Open Data Portal leads on measured uptime — openSenseMap at 90.2% 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, openSenseMap or PM2.5 Open Data Portal?
openSenseMap has the lower median latency in our checks — openSenseMap responds in 655 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 openSenseMap and PM2.5 Open Data Portal need an API key?
Neither needs a paid key — openSenseMap 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 openSenseMap and PM2.5 Open Data Portal from the browser?
Only openSenseMap 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 openSenseMap and PM2.5 Open Data Portal free for commercial use?
openSenseMap 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.