With this new feature called “Ad Review Centerâ€, users of Google AdSense can now preview their ads even before they appear in the posts.
“The Ad Review Center (ARC) will give you more transparency and control by enabling you to approve or disapprove placement targeted ad creatives before they appear in your posts.â€
“To get started with this tool, please login to your AdSense account. You will find ARC in the ‘Competitive Ad Filter’ section located under the ‘AdSense Setup’ tab. If you are using your AdSense account for other products- content, mobile, or video- please make sure to select the Client-ID starting with ca-feed-pub.†– Barbara Bochner, Google Publisher Solutions Team
Visit Help Center for more info!