文章基本信息

标题：The Microbial Activity in PM2.5 in Indoor Air: As anIndex of Air Quality Level
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作者：Hanlin Chen ; Rui Du ; Weishan Ren 等
期刊名称：Aerosol and Air Quality Research
印刷版ISSN：1680-8584
出版年度：2021
卷号：21
期号：2
页码：1-13
DOI：10.4209/aaqr.2020.03.0101
语种：English
出版社：Chinese Association for Aerosol Research in Taiwan
摘要：Bioaerosols are a major source of pollution in indoor environments, where people spendapproximately 90% of their time, and the microorganisms adhered to PM2.5 adversely affecthuman health. However, most research has focused on the concentration of these aerosols andthe factors that influence it rather than the correlation between microbial activity and air quality.Thus, this study used a modified technique of fluorescein diacetate (FDA) hydrolysis to evaluatethe activity of microorganisms in the PM2.5 during three seasons (summer, autumn and winter) inBeijing. 0.155–5.388 ng m–3and 0.091–5.740 ng m–3 ofsodium fluorescein, a marker of microbialactivity, were measured indoors and outdoors, respectively; thus, no significant difference inconcentration between the two environments was detected, but the indoor activity was affectedby outdoor conditions to an extent. The most active season was autumn, followed by winter andsummer. Furthermore, the highest activity in summer and autumn was observed duringconditions of excellent air quality, and in summer, the activity during conditions of good air qualityalso obviously exceeded that during conditions of slight pollution. Additionally, the microbialactivity in a room varied according to the room’s ventilation (or lack thereof), suggesting a strongassociation between these parameters. In general, when the air quality was excellent, 20 minutesof ventilation achieved the optimal air exchange, but this duration should be reduced duringpolluted conditions. Our results provide new insights into evaluating the indoor air quality basedon the microbial activity.
关键词：Fluorescein diacetate;Season;Pollution level;Ventilation