The IQAir's AirVisual air quality sensor comes with an inbuilt device API. You can use this at any time to access your device's measurements, which can be used in a range of applications.
To access your device API, first log in to your IQAir dashboard. On your device list, click the desired device to access its details page, then scroll down to access your device API link on the bottom of the right menu bar.
You can learn more about the Pro API's returned JSON format with the below article:
Why is AQI different between two phones?
Reported AQI levels seem lower than it appears visually