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The discharge rates of halogens in aerosols and gases emitted from Mount Erebus between December 1986 and January 1991 were estimated by combining element-to-sulfur ratios on filter samples with SO2 output measured by COSPEC. The halogen and sulfur content of the gas vary in a quasi-cyclical pattern possibly because of a heterogeneous distribution of volatiles in the Erebus magmatic system. The emission rates of HF and HCl have increased twofold since 1986 reaching 6 and 13.3 Gg yr−1, respectively, in 1991, making Erebus an important contributor of halogens to the Antarctic atmosphere.