佛山市臭氧浓度时间变化特征及主要影响因子

对佛山市2011—2014年O_3监测数据进行分析,结果表明,ρ(O_3)日变化呈现明显的单峰特征,2011—2014年O_3日最大8小时滑动均值(O3-8 h)的年评价值没有出现显著的下降趋势,超标值多出现在8—10月。夏季O3-8 h与日平均气温的相关系数较高,O_3污染多发生在气温30℃,相对湿度为50%~70%的气象条件下。相对湿度60%,气温为20~25℃,也可能出现O3污染。10℃时,不同的温度条件下,O_3与PM_(2.5)存在正相关关系。在不同的季节时段,O_3-8 h基本随着ρ(NO_2)/ρ(NO)增大而增大。

Temporal Variation of Ozone Concentration and Key Impact Factors in Foshan

After the implementation of the new ambient air quality standards, O3 pollution is more and more concerned. Especially in the Pearl River Delta, O3 had become one of the main pollutants. This paper analysed O3 monitoring data between 2011 and 2014 in Foshan City. The results showed that the diurnal variation of O3 concentration has obvious characteristic of single peak, daily maximum 8-hour moving average (O3-8 h) was usually the average concentration 11pm to 18pm. Between 2011 and 2014 O3-8 h of the 90th percentile did not decline significantly. O3-8 h of the 90th percentile usually appeares in August, September and October. In summer, O3-8 h and average daily temperature correlated significantly, O3 pollution usually appears when the temperature reaches more than 30℃ and the relative humidity is between 50% and 70%. It might also appear O3 pollution, when the relative humidity is below 60% and the temperature is between 20℃ to 25℃. There is a positive correlation between O3 and PM2. 5 in different tem-perature conditions which is above 10℃. In different seasons, O3-8 h increases as the ρ( NO2 )/ρ( NO) ratio increases.