COMB holds its Out-of-Home Company members to the highest standards of performance through stringent audit procedures.

Data synchronization

The COMB Audit verifies that COMB OOH company members are delivering the correct COMB-approved circulations and where appropriate, corresponding GRPs.

This process ensures that critical data such as circulations, in-market factors and populations are synchronized between COMB and its OOH company members.

Customized software is used to identify discrepancies between COMB data and the trading data used by COMB OOH company members.  This state-of-the art process enables data to be monitored on an ongoing basis, and any errors to be quickly corrected.

To access the 2017 COMB Audit report, click here.

COMB members can learn more about the COMB Audit and its benefits in the COMB Audit section of our website's secured Members' Area.

If you require other information, please contact COMB,, 416-968-3823 x 105.

All COMB OOH Company members participate in the COMB Audit as a condition of membership.


“In a time when measurement across media can lack transparency, our agency team believes strongly in the peace of mind and accuracy provided by COMB for out-of-home products. We believe that COMB members can leverage strong value from their world-class auditing methods.”

Sheri Metcalfe Senior VP,
Co-Managing Director, Jungle-Media


“In a landscape where accountability is critical, we need to make sure that our media partners are delivering value to our clients. The COMB Audit is a critical element in this equation and we are pleased to see our partners’ participation once again,”

Andrea Parnell, SVP Managing Director; Initiative.