Dichloromethane (DCM, also known as methylene chloride [CH 2 Cl 2 ]) is often present in industrial waste gas and is a valuable chemical product in the chemical industry.This study addresses the oxidation of airstreams that contain CH 2 Cl 2 by catalytic oxidation in a tubular fixed-bed reactor over perovskite-type oxide catalysts. This work also considers how the concentration of influent CH 2 Cl 2 (C 0 ϭ 500 -1000 ppm), the space velocity (GHSV ϭ 5000 -48,000 1/hr), the relative humidity (RH ϭ 10 -70%) and the concentration of oxygen (O 2 ϭ 5-21%) influence the operational stability and capacity for the removal of CH 2 Cl 2 .The surface area of lanthanum (La)-cobalt (Co) composite catalyst was the greatest of the five perovskite-type catalysts prepared in various composites of La, strontium, and Co metal oxides. Approximately 99.5% CH 2 Cl 2 reduction was achieved by the catalytic oxidation over LaCoO 3 -based perovskite catalyst at 600°C. Furthermore, the effect of the initial concentration and reaction temperature on the removal of CH 2 Cl 2 in the gaseous phase was also monitored. This study also provides information that a higher humidity corresponds to a lower conversion.Carbon dioxide and hydrogen chloride were the two main products of the oxidation process at a relative humidity of 70%.