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中文摘要：
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。
英文摘要：
Objective To measure the daily PM_（2.5） personal exposure level in different microenvironments. Methods Seven staff who had regular time-activity were recruited as the respondents for 12-day investigation of PM_（2.5） exposure in Beijing during Oct.-Nov.,2014. Results The daily personal exposure time were 13.1 h at home, 6.0 h in office and 2.7 h in commute（walking,bus,subway,driving,taxi, bycicle）. The daily personal exposure concentration of PM_（2.5）was about 119 μg/m~3. The daily exposure concentrations of PM_（2.5）were 105 μg/m3 at home, 127 μg/m~3 in office and 152 μg/m~3 in commute respectively. The personal exposure dose of PM_（2.5）was 119 μg/（m3·d）.The exposure dose of PM_（2.5） were 61 μg/（m~3·d） at home, 32 μg/（m~3·d） in office and 13μg/（m~3·d） in commute respectively. The sum of PM_（2.5）exposure dose in the three microenvironments was about 67.6%-100% of the total personal exposure dose. Conclusion The daily PM_（2.5）personal exposure levels of the respondents are higher. So the personal exposure should be paid close attention to. Home, office and commute are the main microenvironments of PM_（2.5）exposure. Interventions in these microenvironments should be implemented preferentially.
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