As far as the impact of air pollutants on human heath being concerned, ozone is one of the main pollutants inatmosphere. In particular, the ground level ozone is responsible for a variety of adverse effects on both human beingand plant life. To protect the humankind from such adverse health effects, early information and precautions of highozone level need to be supplied in times. In this study, statistical characteristics of ground level ozone is analyzedaccording to the field monitoring data in mixed residential, commercial and industrial areas, e.g., Tsuen Wan area inHong Kong. The study deals with the characteristics of hourly and daily mean ozone levels under different climaticconditions such as temperature, solar radiation, wind speed, and other pollutant concentration levels. The study aims toinvestigate the importance of meteorological factors and their impact on relevant pollutant concentration levels fromchemical aspect. Further, reasons causing the spatial and temporal variations of ozone levels are discussed. All theseresults will provide a physical basis for accurately predicting ozone concentration in extensive, future research.