Perovskite catalysts are oxidation catalysts based on mixed oxides with a perovskite crystal structure, generally described by the formula ABO3. The A site is usually occupied by rare earth metals such as lanthanum, often partially substituted with strontium, and the B site by transition metals such as manganese, cobalt or iron. Their catalytic activity relies on mobile lattice oxygen and on defects in the crystal lattice, which can be tuned through targeted substitution. Perovskites are considered an alternative or complement to precious metals, as they need little or no platinum and palladium and offer good thermal stability. They are mainly studied and used for the oxidation of carbon monoxide and volatile organic compounds. Compared with precious metal catalysts, the light-off temperature is higher for many substances, and sensitivity to sulphur compounds must be considered. Whether a perovskite catalyst is suitable therefore depends on the temperature level, pollutant spectrum and accompanying substances in the exhaust air concerned.