郑州市城区大气中O_3和NO_x污染特征研究

Pollution Characteristics of O_3 and NO_x in the Atmosphere of Zhengzhou

通过探究O_3和NO_x污染特征,为郑州市城区大气中O_3和NO_x污染防治提供技术支撑,对郑州市城区O_3和NO_x浓度变化、反周末效应及大气氧化性(OX)污染特征进行了分析.结果表明,郑州市四个站点O_3浓度呈夏季>春季>秋季>冬季,夏季O_3日均浓度呈银行学校>经开区管委>市监测站>岗李水库的趋势.并且NO、NO_2日均浓度周末高于工作日,O_3周末日均浓度低于工作日,尤其在0:00—08:00时间段呈现出明显的反"周末效应"现象.夏季NO_2光解速率:银行学校>岗李水库>经开区管委>市监测站,其中银行学校和市监测站NO_2日均光解速率分别为1.07 min^(-1)和0.24 min^(-1),揭示了O_3浓度高低不仅与OX和NO_2光解速率变化有关,而且与O_3前体物浓度高低有关.

To provide fundamental data for the prevention and control of O3 and NOx pollution in the atmosphere of Zhengzhou,the characteristics of O3 and NOx pollution including variations on concentration levels,anti-weekend effects are discussed in detail,and characteristics of the atmospheric oxidant（OX）pollution were explored as well.The results indicate that the orders of the concentration of O3 were：summerspringautumnwinter,and Bank School（BS）Economic Development Zone Commission（EC）Municipal Monitoring Station（MS）Gangli Reservoir（GR）in summer. At the four monitoring stations,daily average concentrations of NO and NO2 at the weekend were slightly higher than at weekday;while it was weekend weekday as to the concentrations of O3 and NOx ,especially during 0：00-08：00. The photolysis rates of NO2 followed the order of BSGRECMS,the daily average photolysis rate of NO2 was 1.07 min^-1 and 0.24 min^-1 at BS and MS,respectively. The paper demonstrates that the O3 pollution was not only related to the change of photolysis rate of OX and NO2,the abundance of O3 precursors also make contributions,and strict measures aiming to reduce emissions of relevant air pollutants around each site should be executed in the future.