| Title: | Smog Chamber Study on the Role of NO(x) in SOA and O(3) Formation from Aromatic Hydrocarbons |
| Author(s): | Chen T; Zhang P; Ma Q; Chu B; Liu J; Ge Y; He H; |
| Address: | "State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. University of Chinese Academy of Sciences, Beijing 100049, China. Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China" |
| ISSN/ISBN: | 1520-5851 (Electronic) 0013-936X (Linking) |
| Abstract: | "China is facing dual pressures to reduce both PM(2.5) and O(3) pollution, the crucial precursors of which are NO(x) and VOCs. In our study, the role of NO(x) in both secondary organic aerosol (SOA, the important constituent of PM(2.5)) and O(3) formation was examined in our 30 m(3) indoor smog chamber. As revealed in the present study, the NO(x) level can obviously affect the OH concentration and volatility distribution of gas-phase oxidation products and thus O(3) and SOA formation. Reducing the NO(x) concentration to the NO(x)-sensitive regime can inhibit O(3) formation (by 42%), resulting in the reduction of oxidation capacity, which suppresses the SOA formation (by 45%) by inhibiting the formation of O- and N-containing gas-phase oxidation products with low volatility. The contribution of these oxidation products to the formation of SOA was also estimated, and the results could substantially support the trend of SOA yield with NO(x) at different VOC levels. The atmospheric implications of NO(x) in the coordinated control of PM(2.5) and O(3) are also discussed" |
| Keywords: | "Aerosols/analysis *Air Pollutants/analysis *Hydrocarbons, Aromatic *Ozone/analysis Smog *Volatile Organic Compounds NOx concentration aromatic hydrocarbons gas-phase oxidation products ozone secondary organic aerosol;" |
| Notes: | "MedlineChen, Tianzeng Zhang, Peng Ma, Qingxin Chu, Biwu Liu, Jun Ge, Yanli He, Hong eng Research Support, Non-U.S. Gov't 2022/09/23 Environ Sci Technol. 2022 Oct 4; 56(19):13654-13663. doi: 10.1021/acs.est.2c04022. Epub 2022 Sep 22" |
