The iOS limit
Safari on iPhone and iPad has no Web Bluetooth, and neither does any other browser on iOS.
On iPhone and iPad, Safari has no Web Bluetooth, and neither does any other browser on iOS, since they all use Safari's engine. The devices page says so: the Atmotube cannot be paired or read from that phone.
The fiche says the same when you try Read the air there.
What you can do on that phone
The alternative is ATMO's own.
- The Atmotube app keeps the readings and exports them as a CSV file: Settings, Export data to file.
- ATMO offers a cloud API at
api.atmotube.com, with a key requested from them, once Upload historical data to the cloud is on in the app.
Chrome on Android can pair, and so can Samsung Internet, Edge, and Opera where they offer Web Bluetooth. Firefox does not.