You can add and remove your followed locations on the AirVisual app, with the following steps:
1. Search for the location/station you want to follow. Open the AirVisual app and select the magnifying glass icon on the top-left corner, or scroll down to ‘Add place’
2. Key in the location/station you want to follow
3. Press the location/station to enter the location/station page, and click on the heart icon at the bottom-right corner and add it to your ‘Places’
4. Remove a location/station from your ‘Places’ in ‘Manage Places’. To find ‘Manage Places’, you can either:
Scroll down ‘My Air’ page and select ‘Manage’, or
Press the menu bar on the top-right corner of your “My Air” page > Click on ‘Settings’ > Select ‘Manage places’.
5. Press the trash can icon to remove the location/station, and press ‘Yes’ to confirm.
You can find additional information regarding this topic here:
https://www.iqair.com/newsroom/how-to-change-or-unfollow-an-outdoor-station-on-my-pro