Public-service advertising or PSA, is generally sponsored by a nonprofit institution, civic group, religious organization, trade association, or political group. You might notice PSA on your web pages. These ads are displayed because Google Adsense has not been able to find appropriate ads for your page.

So how do Public Service Ads affect your site?

-The most significant fact to consider is that there are no payments for clicks on PSA’s. So even if you have a good CTR...