Ground based in situ observations of b-attenuation at Rucava (LV0010R). 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: ammonium in pm25 (mass_concentration_of_ammonium_in_pm2p5_in_air), arsenic in pm10 (mass_concentration_of_arsenic_in_pm10_in_air), benz_a_anthracene in pm10 (mass_concentration_of_benz_a_anthracene_in_pm10_in_air), benzo_a_pyrene in pm10 (mass_concentration_of_benzo_a_pyrene_in_pm10_in_air), benzo_b_fluoranthene in pm10 (mass_concentration_of_benzo_b_fluoranthene_in_pm10_in_air), benzo_k_fluoranthene in pm10 (mass_concentration_of_benzo_k_fluoranthene_in_pm10_in_air), cadmium in pm10 (mass_concentration_of_cadmium_in_pm10_in_air), calcium in pm25 (mass_concentration_of_calcium_in_pm2p5_in_air), chloride in pm25 (mass_concentration_of_chloride_in_pm2p5_in_air), dibenzo_ah_anthracene in pm10 (mass_concentration_of_dibenzo_ah_anthracene_in_pm10_in_air), inden_123cd_pyrene in pm10 (mass_concentration_of_inden_123cd_pyrene_in_pm10_in_air), lead in pm10 (mass_concentration_of_lead_in_pm10_in_air), magnesium in pm25 (mass_concentration_of_magnesium_in_pm2p5_in_air), nickel in pm10 (mass_concentration_of_nickel_in_pm10_in_air), nitrate in pm25 (mass_concentration_of_nitrate_in_pm2p5_in_air), potassium in pm25 (mass_concentration_of_potassium_in_pm2p5_in_air), sodium in pm25 (mass_concentration_of_sodium_in_pm2p5_in_air), sulphate_total in pm25 (mass_concentration_of_sulphate_total_in_pm2p5_in_air)