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Efficiency of portable HEPA air purifiers against traffic related combustion particles

机译：便携式HEPA空气净化器针对交通相关燃烧微粒的效率

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Exposure to diesel combustion particles is known to cause and exacerbate respiratory conditions, including asthma. High efficiency particulate air (HEPA) purifiers can provide health benefits by reducing concentrations of these particles. National standards call for air purifiers to be tested using tobacco smoke, as well as aerosolized dust, pollen, and potassium chloride (KCl) particles. Little is known about the efficiency of HEPA air purifiers against diesel particles. Previous studies performed with respirator filters have shown higher penetration of combuston generated particles compared to standard test particles. Within a controlled laboratory setting, we compared the Clean Air Delivery Rate (CADR) of six models of air purifiers with diesel and KCl particles, and measured noise during operation. CADR was determined for total concentration and size-selectively for particles of 0.03-1 mu m. Lowest CADRs were consistently found for particles <0.1 mu m. Results showed significant differences between CADRs obtained with diesel and KCl aerosols. This was found for CADRs calculated from total concentration data as well as from size-selective data. Unexpectedly, CADR for diesel exceeded the one for KCl particles indicating lower penetration of diesel particles through the HEPA filter. It was concluded that KCl particles may underestimate the actual CADR against diesel particles. The measurements of noise levels produced by the tested air purifiers revealed a low positive association between noise and CADR (r(2) = 0.55). Thus, both noise and CADR should be considered when selecting an air cleaner. (C) 2015 Elsevier Ltd. All rights reserved.
机译：已知接触柴油机燃烧颗粒会导致并加剧呼吸道疾病，包括哮喘。高效颗粒空气（HEPA）净化器可通过降低这些颗粒的浓度来提供健康益处。国家标准要求对空气净化器使用烟草烟雾以及雾化的粉尘，花粉和氯化钾（KCl）颗粒进行测试。关于HEPA空气净化器对抗柴油颗粒的效率知之甚少。以前使用呼吸过滤器进行的研究表明，与标准测试颗粒相比，燃烧室产生的颗粒具有更高的渗透率。在受控的实验室环境中，我们将六个型号的空气净化器的清洁空气输送率（CADR）与柴油和KCl颗粒进行了比较，并测量了运行期间的噪音。确定了CADR的总浓度，选择了大小为0.03-1微米的颗粒。始终发现<0.1微米的颗粒具有最低的CADR。结果显示，使用柴油和氯化钾气雾剂获得的CADR之间存在显着差异。对于从总浓度数据和尺寸选择数据计算出的CADR，发现了这一点。出乎意料的是，柴油CADR超过了KCl颗粒的CADR，这表明柴油颗粒通过HEPA过滤器的渗透率更低。结论是，氯化钾颗粒可能低估了柴油颗粒的实际CADR。经测试的空气净化器产生的噪声水平的测量结果表明，噪声与CADR之间的正相关性较低（r（2）= 0.55）。因此，选择空气滤清器时应同时考虑噪音和CADR。 （C）2015 Elsevier Ltd.保留所有权利。

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