Why do I have such low pop-under impressions if there are so many visitors on my site?

We count impressions only when our Onclick pop-under ads are opened. Thus, there are several reasons for the difference:

• Some of your visitors are using ad-blocking plugins in their browsers or other ad-blocking software.
  Solution: Ask your visitors to add your website to their white list.
  
  

• Our pop-under ad channel code is not placed on some pages.
  Solution: Check for the pop-under ad channel code on all your pages.
  
  

• Some mobile devices don’t serve the pop-under ads.
  Solution: Use the mobile-optimized ad formats to maximize coverage across devices.