To give you editorial control over the ads that may appear on your site, AdSense offers several options for reviewing and blocking ads.
Ad blocking should be used sparingly. Allowing all ads creates the most competitive atmosphere in the ad auction, with the largest number of ads possible competing for an impression.
The Blocking controls page in your account is where you tell us about individual ads or kinds of ads you don't want on your pages.
Ad review center
The Ad review center lets you review and take action on individual ads that have appeared on your pages. Learn more about the Ad review center.
Let's say you run WidgetUniverse.com and your biggest competitor runs WidgetGalaxy.com. Since your page content is about widgets, WidgetGalaxy ads are automatically matched to your site. To avoid showing your competitor's ads, you can add WidgetGalaxy.com to your list of blocked advertiser URLs, and avoid seeing another ad from them again. Learn more about blocking advertiser URLs.
You can block ads from categories related to sensitive topics such as Religion, Politics, and References to Sex and Sexuality. Sensitive category blocking is available for ads in a limited set of languages, regardless of the language of the site.
You can block ads from general categories such as Apparel, Internet, Real Estate, and Vehicles. General category blocking is available for ads in a limited set of languages, regardless of the language of the site.
Ads from certified Google ad networks are allowed to appear on your pages by default. On this page, you can allow and block specific third-party ad networks, or all future ad networks. Learn more about allowing and blocking ad networks.
You can block certain ad format and auction behaviors in AdSense, such as blocking user-based ads, or allowing additional ad technology vendors in your account. Learn more about ad serving settings.