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The production rules and removal efficiency of harmful byproducts such as NO2 and O3 generated from DC corona discharge in indoor air cleaning were investigated.The production behaviours of NO2 and O3 and the relationship between the amount of catalyst (MnO2)and the removal rate of harmful byproducts were experimentally studied.Further,indoor application tests were carried out in a closed room with 90m3.The results showed that the concentrations of NO2 and O3 produced by corona discharge linearly increased with discharge time.