Polycyclic aromatic hydrocarbon and nitroarene concentrations in ambient air during a wintertime high-NOx episode in the Los Angeles basin |
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| Institution: | 1. College of Atmospheric Sciences, Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, Lanzhou University, Lanzhou 730000, China;2. Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu University of Information Technology, Chengdu 610225, China;3. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;1. Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China;4. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China;1. Indian Institute of Astrophysics, 2nd Block Koramangala, Bangalore 560034, India;2. Center for Environmental Remote Sensing, Chiba University, 1-33 Yayoi-cho, Chiba 263-8522, Japan;3. School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea |
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| Abstract: | The ambient concentrations of polycyclic aromatic hydrocarbons (PAH) (including biphenyl) and nitroarenes were measured during a wintertime, high-NOx episode at a location in Southern California. Daytime and night-time ambient air samples were collected using Hi-vol filters, polyurethane foam (PUF) plugs and Tenax-GC solid adsorbent. 2-Nitrofluoranthene was the most abundant particle-associated nitroarene, but higher concentrations of 1- and 2-nitronaphthalene, methylnitronaphthalenes and 3-nitrobiphenyl were observed on the PUF plugs. Our data show that the ambient concentrations of the more volatile PAH and nitroarenes can be far greater than those of the less volatile species, and suggest that the most abundant nitroarenes in ambient air arise from atmospheric transformations of PAH emitted from combustion sources. |
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