Yes, you can—the Atmotube PRO contains 256 kB of onboard memory. The device can store 14,400 data points, which correspond to one data point per minute over 10 days (1440 minutes per day x 10 days). The data stored on the onboard memory syncs to the Atmotube on connection.

To display the current level of pollution, you can press the main button and check the color of the LED: What is Air Quality Score (AQS)?

If you need GPS data to be stored, the device must remain connected to the Atmotube app.
​
More here: Data Storage and Collection