| 摘要: |
| 利用2018—2022年南通市环境空气自动监测数据，分析了南通市臭氧（O3）污染的基本特征，并着重分析了1次O3 连续污染过程。结果表明：（1）南通市环境空气污染类型由细颗粒物（PM2.5）型向O3 转变，O3 污染呈逐年加重趋势，尤其是2021和2022年O3 污染呈现出现早、结束晚的特点，且超标时间跨度拉长；南通市夏季O3 污染最重、春季略低；从月变化趋势来看，除2020年呈双峰特征外，其余年份为单峰分布；O3 日变化为单峰型。（2）O3 连续污染时，一方面，O3 前体物二氧化氮（NO2）和挥发性有机物（VOCs）出现累积，质量浓度较高；另一方面，污染天风力弱、气温高、紫外辐射强，有利于O3的本地生成及累积，同时也受外来传输影响。（3）芳香烃、含氧挥发性有机物（OVOCs）和烯炔烃为南通市O3生成的主要贡献组分，主要来源于涂料溶剂、二次生成和工业源。 |
| 关键词: 南通市 臭氧 污染特征 前体物 挥发性有机物 氮氧化物 |
| DOI：DOI：10.3969/j.issn.1674-6732.2025.01.007 |
| 分类号:X823 |
| 基金项目:南通市2022年基础科学研究青年科技人才创新专项（JC12022034） |
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| Characteristics of Ozone Pollution and Analysis of a Continuous Ozone Pollution Process in Nantong |
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CUI Jing1， LU Wei1， ZHANG Jiawei2
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1. Jiangsu Nantong Environmental Monitoring Center， Nantong， Jiangsu 226006， China； 2. Shanghai Jianke Environmental Technology Co.， Ltd.， Shanghai 201108， China
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| Abstract: |
| The basic characteristics of ozone pollution in Nantong were analyzed based on the data of automatic monitoring of ambient air from 2018 to 2022， with a focus on the process of continuous ozone pollution. The results showed that： （1） The type of ambient air pollution in Nantong changed from PM2.5 to O3 ， and the ozone pollution showed an increasing trend year by year. Notably， in the past two years， the ozone pollution appeared early and ended late， and the duration of exceeding the standard was extended. The ozone pollution was most severe in summer and slightly lower in spring in Nantong. The monthly variation trend showed a double peak in 2020， and a single peak distribution in other years. The diurnal variation of ozone concentration followed a unimodal pattern. （2） When ozone is continuously polluted， the concentration of ozone precursors NO2 and VOCs accumulates， and the concentration is high. Simultaneously， weak wind， high temperature， and strong ultraviolet radiation are conducive to the local generation and accumulation of ozone and are affected by transmission. （3） Aromatic-hydrocarbon， OVOCs， and enyne are the main components contributing to ozone generation in Nantong， mainly from coating solvents， secondary generation， and industrial sources. |
| Key words: Nantong O3 Pollution characteristics Precursor VOCs NOX |
