Adsense relevency issue on deeper pages

I run a large site with 130,000 pages of content that currently runs adsense on each page.

Google tends to index new pages quickly but after a time drops the older pages out of the index - this is fine as new pages get indexed to replace them.

However I have noticed that the deeper pages no longer show relevent adsense ads, this is a problem as the pages concered do get visitors directly and from other search engines such as yahoo and MSN - but as the ads are not relevent they don't get clicked. I have a Google Sitemap and various navigations that ensure the pages are as close as possible to the home page.

I am not concered about the pages being crawled and indexed by Googlebot (though that would be good) - but they do need to be crawled by mediabot for the above reasons?

Any suggestions as how to address the issue?

Thanks

Clare

 

Interesting question. Have you tried using Google's AdSense section targeting? I haven't used it for my sites, but that may work for your problem. More here:

https://www.google.com/adsense/support/bin/answer.py?answer=23168

 

130 000 pages? That's huge! Putting the adsense code on each page must have taken ages!

 

Thanks - I will add the code - the pages are focussed anyways as they start off with relevent ads when first picked up - but only go off topic once google drops the pages from the main cache.

I have another 300,000 pages of content that I need to add but there doesn't seem much point if the ads are not working correctly.

Clare

 

I find the adsense is pretty relevant nearly at all times on all pages.

 

using <!-- google_ad_section_start --> and <!-- google_ad_section_end --> can help you to show more relevant ads