Adsense will now be implementing the Ads Review Center, It is a function of Google Adsense where you will be able to approve or decline the ads that will try to appear on your site. It is great if you see competitors showing their ads in your blog.
Ads Review center is a asection in your Google Adsense Dashboard. BTW It will not affect your earnings if you will not care about it. It is really hard to know which advertiser do we need to approved or dis approved that is why I leave it as is. Let everybody advertise in my blog 🙂