Mobile phones have a limited screen size, which means that careful planning for your ad placement is especially important. Close proximity of banner ads to other elements within an app is one of the biggest causes of accidental clicks. To avoid accidental clicks, banner ads should not be placed next to interactive buttons, such as a "next" button or a custom app menu bar, next to interactive content such as a text chat box or an image in an image gallery, or on a game play screen where users are continuously interacting with the app.
Review the video below for more best practices:
AdMob banner ads best practices video
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In the following pages, you'll find some AdMob banner ad implementation guidelines and best practices. The examples will help to clarify some of the most frequently used banner ad placements and whether they are aligned with our policies in providing a good user experience. The banner ad examples mostly represent the 320 x 50 banner ad, but these guidelines and best practices apply to all sizes of banner ads. While some of the implementations below that we discourage may not specifically be against our policies, we may still take appropriate action on any invalid activity that they may cause. Not following these guidelines may lead to invalid activity and/or may result in Google disabling ad serving to your app. Please visit our Ad Traffic Quality Resource Centre for more information.