• 关键词：PM_2.5-O₃复合污染  气象条件  VOCs-NO_x  二次颗粒物

• 基金项目：国家自然科学基金（No.41475131，41703088）；大气重污染成因与治理攻关项目（No.DQGG-05-09，DQGG-01-07，DQGG-02-09，DQGG-03-04）；河北省杰出青年科学基金（No.D2017402086）；河北省重点研发计划项目（No.17273712D，19273707D）；河北省青年拔尖人才支持计划；河北省高校百名优秀创新人才支持计划（No.SLRC2017025）

• 赵淑婷
• 1. 河北工程大学能源与环境工程学院, 邯郸 056038;2. 河北省大气污染成因与影响重点实验室, 邯郸 056038

• 王丽涛
• 1. 河北工程大学能源与环境工程学院, 邯郸 056038;2. 河北省大气污染成因与影响重点实验室, 邯郸 056038

• 齐孟姚
• 1. 河北工程大学能源与环境工程学院, 邯郸 056038;2. 河北省大气污染成因与影响重点实验室, 邯郸 056038

• 鲁晓晗
• 1. 河北工程大学能源与环境工程学院, 邯郸 056038;2. 河北省大气污染成因与影响重点实验室, 邯郸 056038

• 王雨
• 1. 河北工程大学能源与环境工程学院, 邯郸 056038;2. 河北省大气污染成因与影响重点实验室, 邯郸 056038

• 刘振通
• 1. 河北工程大学能源与环境工程学院, 邯郸 056038;2. 河北省大气污染成因与影响重点实验室, 邯郸 056038

• 刘营营
• 1. 河北工程大学能源与环境工程学院, 邯郸 056038;2. 河北省大气污染成因与影响重点实验室, 邯郸 056038

• 谭静瑶
• 1. 河北工程大学能源与环境工程学院, 邯郸 056038;2. 河北省大气污染成因与影响重点实验室, 邯郸 056038

• 张雨
• 1. 河北工程大学能源与环境工程学院, 邯郸 056038;2. 河北省大气污染成因与影响重点实验室, 邯郸 056038

• 汪庆
• 1. 河北工程大学能源与环境工程学院, 邯郸 056038;2. 河北省大气污染成因与影响重点实验室, 邯郸 056038

• 许瑞广
• 1. 河北工程大学能源与环境工程学院, 邯郸 056038;2. 河北省大气污染成因与影响重点实验室, 邯郸 056038;3. 中国科学院地球环境研究所, 西安 710061

• 张海霞
• 1. 河北工程大学能源与环境工程学院, 邯郸 056038;2. 河北省大气污染成因与影响重点实验室, 邯郸 056038

• 摘要：本研究在河北工程大学监测站点开展了大气中56种VOCs、NO_x以及气象参数的长期在线监测，结合2013—2019年国控站的在线监测数据，对邯郸市PM_2.5-O₃复合污染特征进行分析.结果表明，邯郸市2013—2019年复合污染天数波动较大，近几年呈现增加趋势，且集中在每年的春夏季.2013—2017年复合污染天数峰值均出现在6月，2018年和2019年出现在3月和4月.气象因素分析结果表明，温度、湿度和气压对邯郸市复合污染影响较明显，当温度为21.0~29.0℃、湿度较高、气压偏低的条件下，更容易发生复合污染，而风速对邯郸市复合污染影响较小.对PM_2.5与O₃相互作用分析发现，冬季高浓度PM_2.5对O₃有抑制作用，夏季PM_2.5浓度不超标时，O₃浓度随其升高而上升，PM_2.5浓度超标后变化趋势相反，当PM_2.5浓度大于125 μg·m^-3时不再出现PM_2.5-O₃复合污染.虽然近年来PM_2.5、SO₂和NO₂浓度下降，但二次转化率依然较高甚至有加强趋势.利用VOCs/NO_x值分析邯郸市O₃生成敏感性，结果显示邯郸市春冬季属于VOCs控制到NO_x控制的过渡区，夏秋季属于NO_x控制区，且复合污染日VOCs/NO_x值（6.3）最小，清洁日（9.3）最大.复合污染时NO₃^-和OC浓度较高，OC/EC值与其他污染日相比最大，说明复合污染时二次污染严重，有效治理PM_2.5-O₃复合污染必须减排能同时形成O₃和二次有机气溶胶的高活性有机物.

• Abstract：This study pursued a long-term online monitoring of atmospheric 56 species of VOCs, NO_x and meteorological parameters at a site in the campus of Hebei University of Engineering in Handan. Combined with the observation data from the four National Air Quality Stations from 2013 to 2019, the characteristics of PM_2.5-O₃ complex pollution in Handan were analyzed. Our results showed that the number of complex polluted days in Handan fluctuates significantly in 2013 to 2019, and presented a deteriorating trend in recent years. The complex polluted days concentrated in spring and summer, that the peak number occurred in June in 2013-2017, and occurred in March and April in 2018 and 2019, respectively. The analysis of the meteorological factors showed that temperature, humidity and air pressure had an obvious influence on the complex pollution of Handan. Temperature between 21.0℃ and 29.0℃, high humidity and low air pressure were more likely to cause complex pollution, while wind speed had a relatively small impact on the pollution. The interactions between PM_2.5 and O₃ showed that high concentrations of PM_2.5 had an inhibitory effect on O₃ in winter. In summer, when PM_2.5 concentration did not exceed the standard, O₃ concentration increased with PM_2.5 increasing, but when PM_2.5 concentration exceeded the standard, the trend was opposite. Although the concentrations of PM_2.5, SO₂ and NO₂ decreased in recent years, the secondary aerosol conversion rate was still high and even tended to strengthen. The VOCs/NO_x value was used to analyze the sensitivity of O₃ generation, indicating that in spring and winter O₃ in Handan was in the transition zone from VOCs control to NO_x control, while summer and autumn it was in the NO_x control zone. Besides, the VOCs/NO_x reached the smallest in complex polluted days (6.3) and was the largest in cleaning days (9.3). The concentration of NO₃^- and OC was higher, and the OC/EC reached the highest in complex polluted days, indicating that the secondary pollution was more severe during complex pollution. In order to effectively control PM_2.5-O₃ complex pollution in Handan, the emission reduction of highly active organic matter should be considered to reduce O₃ and secondary organic aerosol simultaneously.

• Key words：complex pollution of PM_2.5-O₃  meteorological factors  VOCs-NO_x  secondary PM

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