PM2.5 Open Data Portal vs US Weather
Same instrument, two spec sheets — measured, not claimed.
PM2.5 Open Data Portal vs US Weather: common questions
Which is more reliable, PM2.5 Open Data Portal or US Weather?
Both are neck-and-neck — PM2.5 Open Data Portal and US Weather 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 US Weather?
US Weather has the lower median latency in our checks — PM2.5 Open Data Portal responds in 796 ms versus US Weather at 223 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 US Weather need an API key?
Neither needs a paid key — PM2.5 Open Data Portal is callable with no signup, and US Weather is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call PM2.5 Open Data Portal and US Weather from the browser?
Only US 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 US Weather free for commercial use?
PM2.5 Open Data Portal has unclear commercial terms, and US Weather 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.