AIR PURIFYING DEVICE

PURPOSE:To switch over deodorizing function automatically and keep maintenance-free for a long time by providing a dust collection section on the downstream side of air flow and a charged section and an odor sensing means on the upstream side and operating an ozone generating means corresponding to the variation of odor quantity in the air sucked in. CONSTITUTION:A charged section 1 consisting of a discharge line 2 and a flat electrode 3 and an odor sensing means 11 are provided on the upstream side to the air flow and a dust collecting section 5 and an ozone generating means 13 are provided on the downstream side. The result of measuring the odor quantity by the odor sensing means 11 is input into an odor quantity deciding means 12, which is input into a power source device 4 to start deodorizing operation for the ozone generating means 13 when the odor quantity is beyond the given value, and to stop the operation when the quantity is less than the given value. Further, a timer 18 for computing the operation time of the ozone generating means 13 and means 15 and 16 for deciding and indicating the exchange time of ozone decomposing mediums 13 from the time computed by said timer 18. Deterioration of deodorizing effect with time is eliminated by said arrangement and deodorizing function is kept maintenance-free for a long time.