When you first opt into the Ad Review Center, you'll be able to see all placement-targeted ads currently targeted to your site, and a couple of days later you'll be able to review placement-targeted ads that have previously run on your site.
In addition to letting publishers weigh in on the relevance of placement-targeted ads, the Ad Review Center will also help advertisers improve their placement-targeted ad campaigns. When you block an ad, you'll be prompted to select a reason. We'll share this constructive feedback with advertisers so they can use it to improve the quality and relevance of future ad campaigns.
As we've done with past features, we're gradually launching the Ad Review Center to all publishers over the next few months. When it has been enabled for your account, you'll see a green notification box at the top of your 'Competitive Ad Filter' page, located under the 'AdSense Setup' tab.
You'll then have 24 hours to review ads before they are automatically allowed to run on your site. Please note that you can also return to the Ad Review Center and allow a previously blocked ad, or block a previously allowed ad.