If you are a publisher using Google adsense to monetize your site, you may have the occassion of seeing irrelevant or totally useless ads that leads to pages that sucks and deceiving. You don’t want these kinds of ads to appear on your site, and especially when you know that they are low paying pay per click.
Adsense allows you to filter out competing sites which you don’t want to be shown in the adsense ads on your site. Just login into adsense -> Adsense Setup -> Competitive Ad Filter and write in the site url that you want to be filtered out from your ads.
At the same page are provided with some examples of how you can set the filter.
URL entered: example.com (Most broad)
URL entered: www.example.com (Less broad)
URL entered: forums.example.com (More specific)
URL entered: forums.example.com/page (Most specific)
Go and try it out. Help yourself by getting rid of those ads that you have long wanted to get rid of.