The observations of ozone sounding at Shanghai Baoshan National Climate Stations during May 2007 and December 2009 are analyzed. The results show that ozone vertical distribution is mainly influenced by photochemistry and dynamic transport. Ozone distribution in the boundary layer and the middle and upper stratosphere is apparently influenced by photochemistry. In the boundary layer, ozone concentration gradient varies positively. Influencing factors such as temperature, radiation and vapor, lead to a seasonal variation of highest ozone in the summer and lowest ozone in the winter. Above 26 km, photochemical processes lead to the highest ozone concentrations in the middle and upper stratosphere in the summer, vice versa in the winter. Dynamic transport significantly influences ozone level in upper troposphere and lower stratosphere, about 10-17 km. Ozone concentration is highest in spring due to the process of stratosphere-troposphere exchange.

Ground-level NO₂ concentrations in Shanghai between May 2006 and August 2008 are estimated using the tropospheric NO₂ column concentration data of Ozone Monitoring Instrument (OMI) onboard AURA. In-situ measurements of surface NO₂ concentrations of Xujiahui, Shanghai are corrected using global 3-D chemical transport model MOZART-2, and are used to validate the surface NO₂ concentrations derived from tropospheric columns. The results show a significant correlation between monthly mean OMI derived surface NO₂ concentrations and in-situ NO₂ surface concentrations (R²=0.88), indicating that it is reliable to infer ground-level NO₂ concentration from NO₂ tropospheric column concentration.

The study of general status of NMOCs, NMOCs composition and ozone formation potentials of various NMOCs species help better understand the ozone problem and make effective ozone abatement strategies in NMOCs-sensitive regime. Analysis of NMOCs 24-hours sampling from November 6, 2005 to August 8,2007 in urban Shanghai Xujiahui indicates that daily NMOCs display no apparent seasonal variation with average concentration of about 50 ppbv. The major components are alkanes, alkenes and aromatics. Due to their relatively high reactivities and concentrations, aromatics play a dominant role in contributing to ozone photochemical production. Toluene, xylene, ethylbenzene, butene and propene are found to be among the top list of ozone formation potentials. NMOCs in urban Shanghai are largely of anthropogenic origin. They are mainly from vehicular exhausts, evaporation of solvents and architectural materials and emissions from the petrochemical complex in the southern Jinshan District.