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: arsenic in pm10 (mass_concentration_of_arsenic_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), chromium in pm10 (mass_concentration_of_chromium_in_pm10_in_air), copper in pm10 (mass_concentration_of_copper_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)