利用重庆市主城区近地面臭氧及前体物、气象因子的连续监测资料，重点分析了主城区夏季典型日臭氧质量浓度时空变化规律，以及臭氧与NO、NO2和CO等前体物及气象因素的相关性。结果表明，近地表臭氧质量浓度具有主城核心区域较低而周围地区较高的空间分布特征；臭氧质量浓度日分布呈“单峰型”，最高小时质量浓度出现在午后16时左右，与太阳辐射强度、温度等气象因素呈显著的正相关关系，同时与NO、NO2和CO等前体物呈负相关关系；高质量浓度臭氧污染易出现在高压天气系统中，即太阳辐射强度大、微风、相对湿度低且气温较高的天气下；臭氧质量浓度升高与大气压下降幅度密切相关，大气压下降超过0.4 kPa时，臭氧质量浓度较高。

Based on the observation data of ozone and its precursor compounds and meteorological factors in near surface layer of Chongqing urban area，this paper emphatically analyzes the temporal and spatial distribution characteristics of ozone in summer. Meanwhile，the correlation between ozone and its precursor compounds，such as NO，NO2，CO，and some related meteorological factors are analyzed. Results show that the concentration of ozone in urban area is lower than that in the surrounding regions. Only one peak of ozone concentration appeared in about 4 p.m. The ozone concentration has an obvious negative correlation with precursor compounds，and has obvious positive correlation with meteorological factors，such as solar radiation and temperature. The appearance of high ozone concentrations resulted from the high pressure weather conditions，especially for the high intensity of solar radiation，breeze，low relative humidity and high temperature. Elevated ozone concentration is closely related to the decrease amplitude of atmospheric pressure. Higher ozone concentrations appear when the decrease amplitude is 0.4 kPa.

环保公益性行业科研专项经费资助(201009001)