While writing WordPress blog articles, I was always concerned at the extra Google Adsense Impressions generated by WordPress preview pages. Now Google Adsense seems to have fixed that and I see no Google Adsense ads on any preview pages.
Since preview urls look like this –
I guess it was not too difficult to block ads on preview pages.
Why is it good that they blocked Adsense ads on WordPress Preview pages – No false impressions inflating cost for CPM advertisers. No accidental clicks on your own Adsense ads. Google Adsense bot visits your final published page only for better targeting. No falsely raised ad page impressions, modifying your Adsense ad statistics reports.