Ground based in situ observations of 2-methylpropenal at Campisabalos (ES0009R) using ads_tube. 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: 2-methylpropenal in air (mass_concentration_of_2_methylpropenal_in_air)