Ground based in situ observations of AMS at Auchencorth Moss (GB0048R). These measurements are gathered as a part of the following projects EMEP, CAMPAIGN and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: ammonia in air (mass_concentration_of_ammonia_expressed_as_nitrogen_in_air), hydrochloric_acid in air (mass_concentration_of_hydrochloric_acid_expressed_as_chlorine_in_air), nitric_acid in air (mass_concentration_of_nitric_acid_expressed_as_nitrogen_in_air), nitrous_acid in air (mass_concentration_of_nitrous_acid_expressed_as_nitrogen_in_air), sulphur_dioxide in air (mass_concentration_of_sulphur_dioxide_expressed_as_sulphur_in_air)