许昌市臭氧污染趋势及时空分布特征研究

Pollution Trends of Ozone and Its Temporal and Spatial Distribution Characteristics in Xuchang

为研究许昌市的臭氧(O_3)污染情况及时空分布特征,对2014年-2016年许昌市3个国家环境空气监测点位的监测数据进行了统计分析。结果表明:2014年-2016年,许昌市O_3污染状况整体呈加重趋势,2016年污染最为严重;O_3浓度和超标天数均具有明显的季节变化特征,春末和夏季的O_3污染最为严重;不同季节的O_3、NO_2、NO和NO_x浓度日变化也不尽相同,同时O_3具有明显的日变化特征,呈单峰型分布,峰值出现在14:00~15:00;并且O_3与NO_2具有较好的相关性。

To study the pollution distribution of ozone in Xuchang, this paper analyzed the 2014 -2016 monitoring data of 3 national air monitoring stations in Xuchang. The results showed ： the ozone pollution of Xuchang was getting worse in 2014 - 2016, where in 2016 the most serious pollution happened. Ozone concentrations inXuchang had obvious seasonal characteristics. The most serious pollution appeared in late spring and summer. The diurnal variation of ozone, nitrogen dioxide, nitric oxide and ni- trogen oxideconcentrations in different seasons were not the same, and the ozone also had obvious diurnal variation, which showed a single peak distribution, maximum occurred during the day around 14：00- 15：00. Ozone and nitrogen dioxidehave a good cor- relation.