PROBLEM TO BE SOLVED: To provide an air cleaner capable of suppressing concentration of a pollutant contained in a processed air discharged from the air cleaner to a reference value or less when concentration elimination is generated.;SOLUTION: An air cleaner 10 has a plasma catalyst reactor 20 having a catalyst part 23 inside, a first gas concentration sensor 41 for measuring gas concentration of a processed air supplied to the plasma catalyst reactor 20, a voltage impression part 60 for generating plasma in the plasma catalyst reactor 20, and a plasma switch control part 71 for calculating maximum value of gas concentration of the processed air discharged from the plasma catalyst reactor 20, when generation of the plasma is initiated at gas concentration measured by the first gas concentration sensor 41, and initiating generation of the plasma in the plasma catalyst reactor 20 depending on the maximum value.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2019,JPO&INPIT
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