As the awareness of public health/safety becomes important and the desire to provide clean/safe indoor air in a sustainable way increases, air filtration technology has become essential at urban built facilities, which are challenged by significant outdoor air pollution due to dense population and heavy traffic. To provide comparable/objective data for designers and professionals of gas-phase filtration equipment in HVAC systems, it is important to understand the performance and characteristics of possible filter medium candidates within a reasonable testing period at low levels of target hazard concentration (typically, ~0.05 ppm). The present study investigated the 2000-time scale-down evaluation evidence and its behind reasons between practical high-concentration tests (~100 ppm NO₂) and actual low-concentration ones, and investigated potential dangers identified during the study in utilizing activated carbon (AC)-based virgin filter media in indoor applications due to unexpected NO-desorption phenomenon. Six filter media of AC-based and non-AC with different type/pellet/shape/size/target compound were selected and tested for abating NO₂ mainly originated outdoors. A multi-channel simultaneous testing system was utilized for similar standard testing conditions. The study findings provide previously unavailable experimental data and new insight into the behavior of widely used filtration media against NO₂ for the enhancement of urban resilience.

随着公众健康/安全意识的提高以及以可持续方式提供清洁/安全的室内空气的需求日益增加，空气过滤技术已成为城市建筑设施中必不可少的组成部分，由于人口稠密和室外空气污染严重，这些设施面临着挑战。交通繁忙。为了向HVAC系统中的气相过滤设备的设计者和专业人员提供可比较的/客观的数据，重要的是要了解在合理的测试时间内，在目标危害浓度较低的情况下，可能的过滤介质候选物的性能和特性（通常为〜 0.05 ppm）。本研究调查了2000倍按比例缩小的评估证据及其在实际的高浓度测试（〜100 ppm NO ₂之间）的背后原因）和实际的低浓度污染物，并研究了在研究过程中由于意外的NO脱附现象而在室内应用中使用基于活性炭（AC）的纯净过滤介质的潜在危险。选择了六种不同类型/颗粒/形状/大小/目标化合物的AC型和非AC过滤介质，并进行了测试，以减少主要源自室外的NO ₂。多通道同时测试系统用于类似的标准测试条件。该研究结果提供了以前无法获得的实验数据，并为广泛使用的针对NO _2的过滤介质的行为提供了新的见识，以增强城市的适应能力。