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Aerosol samples (PM10) were collected using an aethalometer from 15 July 2001 to 18 April 2004 at the PICO-NARE site in Pico island, Azores, Portugal. The aethalometer is at an altitude of 2225 m AMSL, and sampled for 24 h in most cases, and for a few periods continuously. Samples were assessed through instrumental neutron activation analysis (k0-variant), and concentrations of up to 15...