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目的调查PM_(2.5)个体暴露水平,评估不同微环境的PM_(2.5)暴露量。方法于2014年10—11月在北京市招募时间-活动模式较为规律的7名办公室职员为调查对象,采用PM_(2.5)个体暴露追踪监测结合日志记录时间-活动模式的方式开展为期12 d的研究。结果调查对象在家、办公室和交通微环境(步行、公交车、地铁、私家车、出租车、自行车)的日均暴露时间分别为13.1、6.0、2.7 h;24 h的PM_(2.5)个体暴露日均浓度为119μg/m~3,家、办公室和交通微环境的PM_(2.5)暴露日均浓度分别为105、127、152μg/m~3;24 h PM_(2.5)个体暴露量为119μg/(m~3·d),家、办公室和交通的PM_(2.5)暴露量分别为61、32、13μg/(m~3·d),三种微环境的PM_(2.5)暴露量之和占总暴露量的67.6%~100%。结论调查人群的PM_(2.5)个体暴露水平较高,应予以高度重视;家、办公室和交通是主要的PM_(2.5)暴露环境,应对PM_(2.5)污染应优先考虑采取干预措施。
Objective To investigate the individual exposure level of PM 2.5 and assess the PM 2.5 exposure in different microenvironment. Methods Seven office workers recruited from Beijing from October to November 2014 with a regular pattern of time and activity were selected as subjects to conduct a 12-day trial of PM 2.5 exposure monitoring and log-time-activity model the study. Results The average daily exposure time of the respondents at home, office and traffic micro-environment (pedestrian, bus, subway, private car, taxi, bicycle) were 13.1, 6.0 and 2.7 h, respectively; The mean daily PM_ (2.5) exposures at home, office and traffic microenvironment were 105,127 and 152μg / m ~ 3, respectively. The average exposure time was 119μg / m ~ PM 2.5 exposure at home, office and traffic was 61, 32 and 13 μg / (m 3 · d) respectively. The sum of PM 2.5 exposed to the three microenvironment accounted for 67.6% ~ 100% exposure. Conclusions PM_ (2.5) individuals in the surveyed population have a high level of exposure, and PM_ (2.5) exposure should be the main home, office and traffic environment. PM_ (2.5) pollution should be given priority to take intervention measures.