Research about the pollution of benzene,methylbenzene,dimethylbenzene and methylaldehyde in the indoor decorated air

Investigating the indoor decorated air of Qingdao,we devided three groups according the decorated time a week to six months,seven months to a year and over one year. Benzene,methylbenzene,dimethylbenzene and methylaldehyde are detected.The result is in the short decorated time, the concertration of benzene,methylbenzene,dimethylbenzene are high and the concertration of methylaldehyde is low.with the time increasing, the concertration of benzene,methylbenzene,dimethylbenzene decreasing and the concertration of methylaldehyde increasing. People should take eye on the pollution of indoor air.