Mendez-Jimenez David, Lakey Pascale S J, Johnson Grace, Shiraiwa Manabu, Jung Heejung
Department of Mechanical Engineering, University of California, Riverside, USA.
CE-CERT, University of California, Riverside, USA.
Environ Sci Process Impacts. 2022 Oct 19;24(10):1725-1734. doi: 10.1039/d2em00129b.
This paper investigates the effects of ionizers on the ozone concentration within vehicle cabins by using a series of measurements combined with a kinetic box model. Testing consisted of measuring ozone concentration during static tests where the ventilation of the test vehicle was turned on and off depending on the test. This testing was repeated for three different portable ionizers and two vehicles with built-in ionizers. Ionizer A produced ozone at a rate of ∼0.04 ppb s (∼0.68 mg h), which increased the in-cabin O concentrations of a Mitsubishi Mirage to ∼10 ppb with the fan off and ∼6 ppb in the recirculation mode. In the fresh air mode, in-cabin O concentrations were dominated by outdoor-to-indoor transport. Ionizer B and C produced O at a rate of less than 0.008 ppb s (<0.14 mg h); however, during retesting, ionizer C was shown to emit large amounts of ozone for short amounts of time while being tested up close. The same testing was completed on vehicles with built-in ionizers; these produced <0.01 ppb s (<0.32 mg h in the Buick Enclave and <0.25 mg h in the Hyundai Genesis), and in-cabin O concentrations were again dominated by outdoor-to-indoor transport with fresh air ventilation. While ionizers are currently regulated, the negative impact they have on in cabin air quality is important to continue monitoring.
本文通过一系列测量结合动力学箱模型，研究了离子发生器对车厢内臭氧浓度的影响。测试包括在静态测试期间测量臭氧浓度，测试车辆的通风根据测试情况开启和关闭。对三种不同的便携式离子发生器和两辆内置离子发生器的车辆重复进行了此测试。离子发生器A产生臭氧的速率约为0.04 ppb·s（约0.68 mg/h），在风扇关闭时，这使得三菱Mirage车内的臭氧浓度增加到约10 ppb，在循环模式下为约6 ppb。在新鲜空气模式下，车内臭氧浓度主要受室外到室内传输的影响。离子发生器B和C产生臭氧的速率小于0.008 ppb·s（<0.14 mg/h）；然而，在重新测试期间，离子发生器C在近距离测试时被发现会在短时间内排放大量臭氧。对内置离子发生器的车辆也完成了相同的测试；这些车辆产生的臭氧速率<0.01 ppb·s（别克昂科雷中<0.32 mg/h，现代Genesis中<0.25 mg/h），并且在新鲜空气通风的情况下，车内臭氧浓度同样主要受室外到室内传输的影响。虽然目前对离子发生器有相关规定，但它们对车内空气质量的负面影响仍需持续监测。
