Open-Meteo vs PM2.5 Open Data Portal
Same instrument, two spec sheets — measured, not claimed.
Open-Meteo vs PM2.5 Open Data Portal: common questions
Which is more reliable, Open-Meteo or PM2.5 Open Data Portal?
On our scheduled checks, PM2.5 Open Data Portal leads on measured uptime — Open-Meteo at 95.1% 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, Open-Meteo or PM2.5 Open Data Portal?
Open-Meteo has the lower median latency in our checks — Open-Meteo responds in 673 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 Open-Meteo and PM2.5 Open Data Portal need an API key?
Neither needs a paid key — Open-Meteo 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 Open-Meteo and PM2.5 Open Data Portal from the browser?
Only Open-Meteo 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 Open-Meteo and PM2.5 Open Data Portal free for commercial use?
Open-Meteo is personal/non-commercial only, 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.