Shang joined the Russell group of SIO in the fall of 2006. His research focused on the sources and formation of ambient secondary organic aerosols (SOA). To achieve this goal, he conducted several field measurements to study the chemical and physical properties of ambient aerosols using a set of online and offline techniques, including FTIR, HR-ToF-AMS, SMPS, and STXM-NEXAFS. He applied factor analysis to the ambient measurements to extract the sources that likely contributed to the SOA. To better understand the SOA formation mechanisms, Shang conducted reaction chamber studies in the lab. Special attention is given to the formation and loss of organonitrate functional groups. Shang has now finished working on the data collected at Bakersfield in May and June 2010 during the CalNex project.