end ornament
2.Methods According 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) end 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.

