In this paper, the ozone monitoring data inthe selected pilot cities of Beijing, Shenyang, Shanghai and Chongqing from 2008 to 2016were analyzed. It can be seen that the ozone pollution in Beijing was the most serious in four cities. Ozone pollution characteristics of four cities are higher value with relatively larger proportion, the proportion of lower concentrations of ozone is relatively lower. The annual average ozone concentrations in Beijing, Shenyang and Shanghai increased overall from 2008 to 2016. The proportion of days beyond the standard was 15. 9％ in Beijing, 7. 7％ in Shanghai, 3. 9％ in Chongqing, and 6. 5％in Shenyang in 2008-2016. Shanghai's ozone concentration is very high in the fall. The trend of ozone changing in 2012 is quite unusual, which probably due to unusual weather conditions that occurred in 2012. The changes of ozone concentrations in four cities are highly correlated with changes in meteorological conditions.%选取臭氧试点城市北京、沈阳、上海和重庆,通过对2008—2016年臭氧监测数据进行分析研究,可以看出4个试点城市中北京的臭氧污染最严重.4个城市的臭氧污染特征均为高浓度臭氧所占比例较大,高值比较高,低浓度臭氧所占比例较小.北京、沈阳和上海的年平均臭氧浓度总体呈上升趋势.北京、上海、重庆、沈阳4个城市9年的超标天数比例分别为15.9％、7.7％、3.9％、6.5％.上海的臭氧浓度在秋季非常高.2012年的臭氧变化趋势比较异常,可能是由于2012年发生的不寻常气候条件导致.4个城市的臭氧浓度变化和气象条件的变化显著相关.
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