Google + Advanced Navigation. How to stop indexing pages?
By default, Google indexes category pages with Ajax navigation. If you want to stop this, you need to add the corresponding information to robots.txt file.
Please pay attention that this information is applicable to the extension version 4.0 and older.
Using an FTP client find and open the robots.txt file.
Add a row with the content Disallow: /*?ajax=1 into the file and save it.