Ground based in situ observations of indeno_123cd_perylene at Lahemaa (EE0009R) using high_vol_sampler. These measurements are gathered as a part of the following projects EMEP and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: indeno_123cd_perylene in pm10 (mass_concentration_of_indeno_123cd_perylene_in_pm10_in_air)