Articles | Volume 18, issue 3
Research article
05 Feb 2018
Research article |  | 05 Feb 2018

Effects of NOx and SO2 on the secondary organic aerosol formation from photooxidation of α-pinene and limonene

Defeng Zhao, Sebastian H. Schmitt, Mingjin Wang, Ismail-Hakki Acir, Ralf Tillmann, Zhaofeng Tan, Anna Novelli, Hendrik Fuchs, Iida Pullinen, Robert Wegener, Franz Rohrer, Jürgen Wildt, Astrid Kiendler-Scharr, Andreas Wahner, and Thomas F. Mentel


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Short summary
Air pollutants emitted by human activities such as NOx and SO2 can influence the abundance of secondary organic aerosol (SOA) from biogenic volatile organic compounds (VOCs). We found that NOx suppressed new particle formation and SOA mass formation. When both SO2 and NOx are present, the suppressing effect of NOx on SOA mass formation was counteracted by SO2. High NOx changed SOA chemical composition, forming more organic nitrate, because NOx changed radical chemistry during VOC oxidation.
Final-revised paper