Article Page

The in article Top Banner advert is response depending on screen size. 

• Desktop: 970x250 or 728x90
• Tablet: 728x90
• Phone: 320x50 or 300x50

In article MPUs are fixed at all screen sizes to 300x250.

Timeline

Google Ad Card advert is response depending on screen size. 

• Desktop & Tablet: 728x90
• Phone: 300x250 or 320x250

Native

While on the article page or the timeline you may have a Native Bottom Banner advert which sits above the content. This is an adaptive banner ad and can vary in size. All adverts served here have the same ratio as a 320x50 banner ad. Google will serve the largest banner ad that fits the screen size. To make sure a banner ad is served you should have a default 320x50 advert.