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Regional ozone pollution has become one of the most challenging problems in China, especially in the more economically developed and densely populated regions like Hangzhou. In this study, measurements of O₃, CO, NO_x and non-methane hydrocarbons (NMHCs), together with meteorological data, were obtained for the period July 1, 2013–August 15, 2013 at three sites in Hangzhou. These sites included an urban site (Zhaohui “ZH”), a suburban site (Xiasha “XS”) and a rural site (Qiandaohu “QDH”). During the observation period, both ZH and XS had a higher ozone level than QDH, with exceeding rates of 41.3% and 47.8%, respectively. Elevated O₃ levels in QDH were found at night, which could be explained by less prominent NO titration effect in rural area. Detailed statistical analysis of meteorological and chemical impacts on ozone formation was carried out for ZH, and higher ozone concentration was …