Dielectric barrier discharges are sources of non-thermal plasmas, in which chemical active particles are generated effectively. One of the most promising applications is chemical processing of gaseous substances, e.g. synthesis or decomposition. The removal of air pollutants such as sulfur dioxide from dry and humid air at atmospheric pressure is investigated experimentally as well as theoretically. The role of chemically active particles, especially of atomic oxygen and of OH radicals, is shown. Optimal conditions of the removal process are determined.

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