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Today, we’re pleased to share two new ad sizes - 970 x 250 Billboard and the 300 x 1050 Portrait - that will help you reach more advertisers while also enhancing user experience and engagement on your site.Google AdSense Releases Two New Ad Sizes [adsense.blogspot.com]
As with most of our ad sizes, both of these ad units can accommodate standard text ads in addition to image ads. Additionally, they can show similar-sized image ads when doing so will maximize the performance of your ad unit. In this case, a 300 x 250 ad would serve in the 970 x 250 ad unit and a 160 x 600 would serve in the 300 x 1050 ad unit.
As both of these new sizes are large ad units, you can place a maximum of one per page.