奎屯市环境空气中O_(3)浓度变化特征及影响因子分析

Analysis on the Characteristics and Influencing Factors of Ozone Concentration in Ambient Air in Kuitun

以奎屯市为研究对象,利用环境空气自动监测站2016—2020年监测数据进行统计分析,结果表明2020年奎屯市以O_(3)为首要污染物的天数,O_(3)成为影响奎屯市空气质量的重要因子之一。奎屯市O_(3)浓度随季节变化趋势明显,春季逐渐升高,夏季达到最高,秋季逐渐降低,冬季降到最低,并且O_(3)与大气中的NOx、VOCs等前体物的浓度、太阳辐射的强度都有不同程度的相关性。盒子模型(MCMv3.3.1)分析表明,奎屯市主要处于NOx-控制到过渡区域,即削减当地的人为源VOC(AVOC)和NOx能够有效降低该区域的光化学污染,各组份的相对增量反应活性(RIR)大小为RIR(AVOC)>RIR(NOx)>RIR(BVOC)>RIR(CO),其中在AVOC中芳香烃和烯烃对O_(3)的生成贡献最大。本研究将为奎屯市当地O_(3)光化学污染控制提供有效技术支撑。

Taking Kuitun city as the research object,the monitoring data of environmental air automatic monitoring station from 2016 to 2020 are used for statistical analysis.The results show that the number of days with O_(3) as the primary pollutant in Kuitun city ranks the first in 2020,and O_(3) has become one of the important factors affecting the air quality of Kuitun City.The concentration of O_(3) in Kuitun city has an obvious trend of seasonal change,rising gradually in spring,reaching the highest level in summer,decreasing gradually in autumn,and falling to the lowest level in winter.In addition,O_(3) is correlated with the concentration of NOx,VOCs and other precursors in the atmosphere and the intensity of solar radiation to varying degrees.Box model(MCMv3.3.1)analysis shows that Kuitun city is mainly in the NOx-controlled to transition zone,in other words,reducing local anthropogenic VOC(AVOC)and NOx can effectively reduce photochemical pollution in this region.The relative incremental reactivity(RIR)of each component is RIR(AVOC)>RIR(NOx)>RIR(BVOC)>RIR(CO).In AVOC,aromatic hydrocarbons and olefin contribute the most to O_(3) generation.This study will provide effective technical support for local O_(3) photochemical pollution control in Kuitun City.