A comprehensive field measurement was set up in Guangzhou City of China and the key was placed on NO-x and O-3 pollution. The results indicated that the average driving speed of vehicle was only 14 km/h in downtown with high frequency of idle and acceleration. Upward fluxes of CO and NO were observed in Dongfeng Street. NO-x annual mean concentration in urban area increased year by year, and NO-x was identified as the most important pollutant since 1995. Photochemical smog pollution was serious in general, spatial and seasonal distribution of O-3 was observed. O-3 concentration was kept in a high level in autumn, and its formation was restrained in summer due to frequent thunderstorm and high humidity. The numerical simulation showed the average concentration and maximum concentration of O-3 would increase 60%—100% if vehicular emission increased 100% in Guangzhou.
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