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Indoor/outdoor relationship of PM2.5 concentration in typical buildings with and without air cleaning in Beijing

机译：北京市有无空气净化典型建筑中PM2.5浓度的室内外关系

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摘要

Indoor and outdoor particulate matter 2.5 (PM2.5) concentrations were monitored in seven sampling sites: basketball stadium, hotel, shopping centre, research centre, commercial office, apartment building and villa, to determine the indoor and outdoor relationship of PM2.5 mass concentration in the central area of Beijing from February 2014 to March 2014. The influence of four types of ventilation systems on indoor to outdoor (I/O) ratio of PM2.5 concentration was evaluated. The measured results show that the mean I/O ratio of the seven locations was 0.36 when the outdoor PM2.5 concentration was more than 150 mu g/m(3), and 1.1 when the outdoor PM2.5 concentration was less than 100 mu g/m(3), which implies that people's activities could be the most likely factor rather than outdoor sources for elevated indoor PM2.5 levels. The average I/O ratio was 0.69 for public buildings and 0.94 for residential homes, which illustrates that indoor PM2.5 concentrations could be dominated by outdoor sources for residential homes. Approximately 90% of the outdoor particles were removed in public buildings equipped with fan-coil unit with air cleaning plus fresh air system. The results demonstrate the need to improve indoor air quality by using a proper ventilation system with air cleaning.
机译：在七个采样点（篮球场，酒店，购物中心，研究中心，商业办公室，公寓楼和别墅）对室内和室外颗粒物2.5（PM2.5）浓度进行了监测，以确定PM2.5质量的室内和室外关系从2014年2月至2014年3月在北京市中心地区进行浓度监测。评估了四种通风系统对PM2.5浓度的室内/室外（I / O）比的影响。测量结果表明，当室外PM2.5浓度大于150μg/ m时，七个位置的平均I / O比为0.36；当室外PM2.5浓度小于100μg/ m时，平均I / O比为1.1。 g / m（3），这暗示着人们的活动可能是最可能的因素，而不是室外的室内PM2.5水平升高的来源。公共建筑的平均I / O比为0.69，住宅房屋的平均I / O比为0.94，这说明住宅房屋的室内PM2.5浓度可能受室外来源的控制。在配有风机盘管单元，空气净化和新鲜空气系统的公共建筑中，约有90％的室外颗粒被清除。结果表明需要通过使用带有空气清洁功能的适当通风系统来改善室内空气质量。

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