You can block specific ads from appearing on your pages. This is helpful when you don’t want to display particular ads – for example, you might want to block ads leading to competitors’ sites. You can block ads that link (or click through) to specific URLs. This way, you can easily block all ads that are linked to your competitor at www.example.com. By entering a top-level domain such as www.example.com, you’ll also block all ads that link to subdirectories below that domain.
To give you editorial control over the Adsense Google ads that appear on your site, Google offers several options for reviewing and blocking ads that may appear on your pages.
The Blocking controls page in your account is the place where you tell Google if there are any ads that you don’t want, and what kinds you don’t want.
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’ ads, you can add WidgetGalaxy.com to your list of blocked advertiser URLs, and avoid seeing another ad from them again.
General Adsense ad category
You can block Adsense ads from general categories such as Clothing, Internet, Property and Vehicles. General category blocking is available for Google ads in a limited set of languages, regardless of the language of the site.
Sensitive Adsense Ad Category
You can block Adsense 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.
Google Adsense Ad Network
Adsense 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.
Adsense Ad review centre
The Ad review center lets you review and take action on individual ads that have appeared on your pages.
Other blocking options
Google Publisher Toolbar
This Chrome extension allows you to block individual Adsense Google ads and advertiser URLs through overlays that appear on your Adsense ads as you browse your site.