Google Adsense Tips

Some of your ad units are only being seen a fraction of the time. Advertisers want their ads appearing in the most "viewable" positions. By making your ad unit more viewable, you're likely to increase your revenue and be of more interest to advertisers.
Consider placing ads at the bottom of a screen, right above the fold.

The most viewable ad sizes are vertical units, as they stay on screen longer as users browse.

Use a fast, responsive web design, plus responsive ad units, to ensure your ads stay visible no matter the device.