Children’s microenvironmental exposure to PM 2.5 and ozone and the impact of indoor air filtration
JOURNAL OF EXPOSURE SCIENCE AND ENVIRONMENTAL EPIDEMIOLOGY(2020)
摘要
Background In highly polluted urban areas, personal exposure to PM 2.5 and O 3 occur daily in various microenvironments. Identifying which microenvironments contribute most to exposure can pinpoint effective exposure reduction strategies and mitigate adverse health impacts. Methods This work uses real-time sensors to assess the exposures of children with asthma ( N = 39) in Shanghai, quantifying microenvironmental exposure to PM 2.5 and O 3 . An air cleaner was deployed in participants’ bedrooms where we hypothesized exposure could be most efficiently reduced. Monitoring occurred for two 48-h periods: one with bedroom filtration (portable air cleaner with HEPA and activated carbon filters) and the other without. Results Children spent 91% of their time indoors with the majority spent in their bedroom (47%). Without filtration, the bedroom and classroom environments were the largest contributors to PM 2.5 exposure. With filtration, bedroom PM 2.5 exposure was reduced by 75% (45% of total exposure). Although filtration status did not impact O 3 , the largest contribution of O 3 exposure also came from the bedroom. Conclusions Actions taken to reduce bedroom PM 2.5 and O 3 concentrations can most efficiently reduce total exposure. As real-time pollutant monitors become more accessible, similar analyses can be used to evaluate new interventions and optimize exposure reductions for a variety of populations.
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关键词
Air quality, Indoor environment, Children's health, Exposure sensors, Monitoring methods, Exposure assessment
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