Ground based in situ observations of pm10_mass at Narberth (GB0043R) using TEOM_FDMS. 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: pm10_mass in pm10 (mass_concentration_of_pm10_ambient_aerosol_particles_in_air), pm10_mass in pm10_non_volatile (mass_concentration_of_pm10_mass_in_refractory_pm10_in_air), pm10_mass in pm10_volatile (mass_concentration_of_pm10_mass_in_non_refractory_pm10_in_air)