Since our recent introduction of the new 300x600 ad format, we've been happy to see many publishers testing it out on their pages. After carefully reviewing this ad format, we'd like to let you know about an upcoming update to our policies around use of the 300x600 unit.
Because this new format is larger than all our other ad units, we want to help ensure a balance between content and ads across publisher sites. With this in mind, going forward, publishers will be permitted to place a maximum of one 300x600 ad unit on each page. If you've placed more than one 300x600 ad unit per page on your site, we ask that you remove any additional ad units by Jan 10, 2013. We'll also be sending email notifications shortly to affected publishers, asking them to make this update.
Please note that the limit for AdSense for content ad units still remains at three per page, so it'll be possible to place one 300x600 ad unit and up to two other sizes on a page. As always, it's important to consider both the user and advertiser experiences when placing any additional ad units on your pages.
We appreciate your understanding and help as we make this update. Thanks again for all of your feedback and enthusiasm for this new ad format; we're continuing to work on developing new sizes, and will keep you posted on any new developments. If you'd like more information about AdSense policies, please visit our Help Center.
Posted by Charles Huang, Policy Associate
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