Google adsens’s advanced reports now provide the option to view your performance by page, ad unit, or individual ad, as well as link units. We’ve highlighted the differences between each report below, in order of granularity.

• Page impressions are reported every time a user views a page displaying Google ads. We’ll only report one page impression no matter how many Google ads are displayed on a page. For example, if a page with one half banner and one vertical banner is viewed once, we’ll display one page impression.
• Ad unit or link unit impressions are reported every time a user views a Google ad unit or link unit on your page. For example, if a page with one half banner and one vertical banner is viewed once, we’ll display two ad unit impressions.
• Individual ad reports will show an impression for each individual ad that’s shown in any ad unit. For example, if a page with one half banner and one vertical banner is viewed once, it will generate three ad impressions. Will also include individual ads that appear on the page resulting from a link unit click.
• Individual links are available for link unit-only reports, and will show the number of links viewed in a given link unit. This could be 4 or 5 links for each link unit, depending on the format used.

Because ad and ad unit reports will show a higher number of impressions than reports on the page level, you can expect to see a lower eCPM when viewing reports by ad or ad unit.

Note: Reporting by targeting type is now only available for reports at the individual ad level, not the ad unit level.

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