Abstract: ObjectiveTo study tendency of air pollutant concentration in decorated office.MethodsAccording to the completed time,ornament group(150 offices)was divided into 5 groups(2 month group,2~4 month group,5~8 month group,9~11 month group,12~18 month group)and concentiation of air pollutants in these offices was determined.50 offices after decoration over 60 months were regarded as control group and the concentration of indoor air pollutants was determined.The decorative materials in ornament and control group were invested.ResultsThe decorative materials in offices were chiefly coating material,paints,fiber carpet,compound floor,porcelain tile,whitening agent.The concentration of air pollutants of decorated offices were sig nificantly higher than the control group in one year after decoration(P<0.05).The concentration of air pollutants decreased with the time prolonging after decoration arid come to the standard after about one year.The over standard rates of formaldehyde,benzene and amonia was the highest in 2 months and their numerical values were respectively 100%,87.3%,83.9%.The concentration of Radon in ornament and control group was lower than the standard and had nothing to do with completed time.ConclusionOffice decoration caused pollution in indoor air and the concentration of indoor air pollutants mainly correlated with completed time,coating material,paints,fiber carpet,ar tificial board,compound floor,whitening agent.