The Atmospheric Chemistry Studies in the Oceanic Environment (ACSOE) Marine Aerosol and Gas Exchange (MAGE) Eastern Atlantic Experiment (EAE) aimed to quantify input of Dimethyl sulphide (DMS) into a parcel of air, examine the oxidation of DMS and its reaction with nitrogen species with time, investigate the formation of new particles as a results of these transformations, and to discriminate between natural and anthropogenic fractions of sulphur and nitrogen using isotopic measurements. To meet these aims, numerous species of gases and aerosols in the marine boundary layer were measured on land from the Mace Head Research Station, on sea from the RSS Challenger and in the air from the Cranfield Jetstream Research Aircraft during two separate campaigns in 1996 and in 1997, and the observations are currently stored under this collection.