Abstract: Objective To estimate the efficiency of an electr onic dust-accumulated air cleaner for air purification.Methods An enclosed air-conditioned room was selected for installing the electronic dust-accumulated air cleaner,and air samples were collected respectively before the cleaner turning on and after it running for 0h,5h,1h,2h.The concentrations of CO,CO₂,formaldehyde,IP,BT and negativeions were detected by the national standard methods.Results After the cleaner running for 0.5h,the concentrations of IP and BT were significantly declined(P<0.01),but the concentrations of CO,CO₂ and formaldehyde had no obvious change,The concentration of negativeions was significantly increased after the cleaner running for 0.5h(P<0.05).Conclusion The electronic dust-accumulated air cleaner had effects on eliminating IP and BT pollution,and increasing air negative ions.So it may be used to improve the air quality.