PPM is an electronic measurement of radio listening by a 'Portable People Meter'. 2006-2018 the PPM survey was carried out by Kantar TNS Norway. From 2019 onwards Nielsen Media Research is responsible for the survey. PPM has since 2007 replaced data from the interview-based Radioundersøkelsen ('The radio survey') as Norwegian radio channels' official listening data.

The survey is carried out by way of a nationwide panel which is equipped with electronic measuring apparatuses that recognise all radio transmissions from the participating radio channels. Only radio channels taking part in the survey is monitored, and results may vary depending on the number of channels participating.

Local radio channels have been represented mainly by commercial radio chains. In 2014 the survey was extended with several digital NRK channels (DAB) and more DAB channels were included the following years. 2018 onwards only nationwide DAB and online channels are included in the survey. These changes affect both total radio listening and market shares.

Below you can find the radio channels' market shares, daily reach and listening time the average day 2007-2018. Data can be broken down by sex, age and education. Listening data from 2019 onwards can be found here. Comparative listening data for Norway and the other Nordic countries can be found at the Nordic knowledge centre Nordicom.