New development of indoor ultrafine particle-Emission, behavior and control of secondary organic aerosol

挥发性有机化合物（VOCs）形成的二次有机气溶胶（SOA）是室内污染的重要因素。在紫外光照射下，d-柠檬烯与O_3反应生成微粒的报道很多。本论文以d-柠檬烯和对-二氯苯为研究对象，在无初始O_3源的条件下，对VOCs的颗粒形成过程进行了筛选实验。并在真实的房间进行了暴露于住宅房间空气中日常使用的家政产品排放的VOCs的实验。监测了空气中的颗粒物、NOx和O_3浓度。在紫外光照射下用d-柠檬烯进行实验的情况下，当气囊中产生O_3时，颗粒开始形成。相比之下，对于使用对二氯苯（无NOx）的实验，在开始UV照射后立即产生颗粒（<50 nm）。

Secondary organic aerosol(SOA) formation from volatile organic compounds(VOCs) is an important factor of the indoor pollutions. There are many reports about particle for mation by the reaction of d-Limonene and O_3 under UV irradiation. While there are few study about SOA from p-Dichlorobenzene, which is used for a mothball in Japan.In this study, the screening experiments were performed on particle formation from VOCs, especially d-Limonene and p-Dichlorobenzene, without initial O_3 source. And experiment at the real room was performed on exposure to VOCs emitted from housekeeping products under ordinary usage in the residential room air. Particle, NOx and O_3 concentrations in the air were monitored. At the case of experiment with d-Limonene under UV irradiation, particle formation was started when O_3 was generated in the gasbag. In contrast, for experiments with p-Dichlorobenzene(without NOx), particles(<50nm) generated immediately after starting UV irradiation.