南京某幼儿园室内外细颗粒物(PM2.5)质量浓度调查及影响因素分析

Analysis of indoor and outdoor PM2.5 mass concentration and influencing factors of a kindergarten in Nanjing

于2015年4—12月(除7,8月外,每月一周)实测了该幼儿园室内外PM2.5浓度,结果显示:室外PM2.5质量浓度中位值为60.6μg/m^3,室内PM2.5质量浓度中位值为32.5μg/m^3;室内外PM2.5浓度相关系数达0.74,检测期间平均约有52%的室外PM2.5通过建筑围护结构进入室内,室内55%的PM2.5变化由室外颗粒物源导致;实测期间,时均I/O值为0.69,变化范围为0.1~5.46;I/O值受室外PM2.5质量浓度的影响,随室外PM2.5质量浓度升高呈下降趋势,室外PM2.5浓度较高时,I/O值随换气次数减小而减小,室外PM2.5浓度较低时,I/O值随换气次数减小而增大;室外空气湿度与室内外PM2.5浓度正相关,室外风速与室内外PM2.5浓度负相关,而室外温度对室内外PM2.5浓度影响有限,但与I/O值正相关。

Measures the mass concentration of indoor and outdoor PM2.5of a kindergarten during April 2015 to December 2015（one week per month,excluding July and August）.The results show that the outdoor and indoor median PM2.5mass concentrations are 60.6μg/m^3 and 32.5μg/m^3,respectively.The correlation coefficient between indoor and outdoor PM2.5reaches 0.74,52% of the outdoor PM2.5enters into the interior through the building envelope during the measurement period,and 55% of the indoor PM2.5concentration variation is caused by outdoor particle source.The mean value of hourly I/O is 0.69,and the range is 0.1~5.46.The I/O value is influenced by outdoor PM2.5mass concentration,it decreases with an increase of outdoor PM2.5 mass concentration,when outdoor PM2.5concentration is high,I/O decreases with air change rate decreasing and vice versa,the outdoor relative humidity has a positive correlation with varying pattern of indoor and outdoor PM2.5 mass concentration,the wind speed has a negative correlation with indoor and outdoor PM2.5concentration,and the outdoor air temperature is not significantly correlated with indoor and outdoor PM2.5but is positively correlated with I/O.