Particulate Matters in Indoor Air in Jinan During Winter and Spring of 2013

Objective To investigate the concentration of particulate matters in indoor air during the period of winter and spring.

Methods PM_2.5 and PM₁₀ in indoor air were monitored with a LD-5C(B) microcomputer laser instrument in an office in Jinan during working days from January to May.

Results The average concentration of PM_2.5 and PM₁₀ in indoor air was 0.082 mg/m³ and 0.115 mg/m³, respectively. The concentration of PM_2.5 and PM₁₀ in heating season increased from 0.050 mg/m³ and 0.079mg/m³ to 0.152 mg/m³ and 0.191 mg/m³, respectively(P < 0.05). The ratio of PM_2.5/PM₁₀ increased from 0.598 to 0.807 during the transition of non-heating period to heating period(Z=4.917, P=0.001). The correlation coefficient of PM_2.5 and PM₁₀ was 0.878 for indoor air(P=0.001) and 0.701 for outdoor air(P=0.001), respectively.

Conclusions The pollution of particulate matters in indoor air was worse in the winter and spring than that in the other two seasons. The concentration of particulate matters in indoor air and outdoor air was tightly correlated. The influence of heating on the concentration of particulate matters in indoor air was great.