Unique Reach: Incremental Impression Reach

For each time increment within a report — day, week or month — the estimated number of additional new users who were served an ad, and who weren't served an ad during any previous increment. The total for all increments is the impression reach for the full reporting period.

For example, if your report is broken down by day incremental impression reach will show how many unique users were served an ad during Day 1, how many additional users were served an ad during Day 2, and so on. Users are only counted once and attributed to a particular day.