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But I found I only have one sites's adsense ads have impressions.
So I set up new channels and create new ads for each site, and it works for one day, I had 63 impressions totally on that day, but the on second day the impressions dropped to only 3 impressions as normal day.
By the way, I set up 20 ads in my adsense account, but only 1/4 of them have impressions in pass 30 days, I guess Google block my site or use another way to not count my ad impressions of 4 of my 5 sites.
How can I solve this problem? Are my sites banned by google?
1. Visitors leaving before the ads download - look carefully at how quickly your pages are downloading.
2. No inventory available. Look at your content to see if there is sufficient to trigger appropriate keywords. (I stripped the ads out of my photo gallery pages for this reason)