jbayabas - 3:55 am on Aug 17, 2013 (gmt 0)
Let me get this right.. In the month of July this year, you were getting roughly 100k daily ad impressions. Then this month went down to 30k. Where did you get that info that your traffic is up? What's your daily traffic in July compare to August?
My guess is your getting lots of stop words. Browse your site thoroughly (including old posts) in different browsers and computer and check if there's any blank ads.