广西2019—2022年光化学污染特征及成因研究  

Study on the characteristics of photochemical pollution and causes in Guangxi from 2019 to 2022

作　　者：陆志晶 韦江慧 付洁 黄乃尊 姜盼 LU Zhijing;WEI Jianghui;FU Jie;HUANG Naizun;JIANG Pan(Guangxi Key Laboratory of Emerging Contaminants Monitoring,Early Warning and Environmental Health Risk Assessment,Guangxi Environment Monitoring Center,Nanning 530028;Qingdao Huasi Environmental Technology Co.,Ltd,Qingdao 266199)

机构地区：[1]广西壮族自治区生态环境监测中心,广西新污染物监测预警与环境健康评估重点实验室,南宁530028 [2]青岛华思环保科技有限公司,青岛266199

出　　处：《环境科学学报》2025年第3期23-32,共10页Acta Scientiae Circumstantiae

基　　金：广西重点研发计划项目(No.桂科AB20238015)。

摘　　要：近年来,广西的臭氧浓度未呈现显著下降趋势.本研究基于2019—2022年广西14个城市的气象、氮氧化物和5个城市的挥发性有机物(VOCs)数据,分析了广西光化学污染特征及其成因.结果表明,尽管部分年份臭氧日均值有所改善,但2022年显著反弹,尤以东北部城市臭氧污染最为严重.气象因素在广西中西部城市的臭氧污染过程中扮演重要角色,而东部城市则主要受排放等非气象因素影响.2022年9月和10月,气象波动驱动了臭氧浓度的显著反弹.尽管9月和10月的NO2浓度在2019年后未显著下降,但已低于国家标准,减排空间有限.进一步减少NO2还可能导致臭氧浓度上升,未来应重点减少VOCs排放以降低臭氧浓度.2019—2022年,南宁、来宾、桂林、贵港和防城港的VOCs总浓度呈下降趋势,但不同城市间的浓度和组分占比存在显著差异.各城市的臭氧生成潜势前十物种也不同,南宁和桂林主要为烯烃和活性芳烃,来宾和贵港主要为活性芳烃和烷烃,防城港主要为丙烯和活性芳烃.因此,控制活性芳烃和低碳烯烃是降低臭氧浓度的关键,但具体重点物种因城市而异.In recent years,ozone levels in Guangxi have not exhibited a significant decrease.This study delves into the characteristics and origins of photochemical pollution in Guangxi by examining meteorological data,nitrogen oxides from 14 cities,and volatile organic compounds(VOCs)from 5 cities spanning 2019 to 2022.While ozone concentrations decreased in some years,a pronounced rebound occurred in 2022,notably impacting the northeastern cities of Guangxi Province.Meteorological factors played a pivotal role in influencing ozone pollution in central and western cities,with emissions and other non-meteorological factors predominantly affecting eastern cities.Noteworthy meteorological fluctuations in September and October 2022 drove a marked rise in ozone concentrations.Although NO2 levels have not significantly decreased since 2019,they have remained below national standards,indicating limited scope for emission reductions.Further reduction of NO2 might inadvertently escalate ozone concentrations,highlighting the necessity to concentrate on curtailing VOC emissions to alleviate ozone levels.From 2019 to 2022,total VOC concentrations in Nanning,Laibin,Guilin,Guigang,and Fangchenggang have exhibited a declining trend.However,variations in concentration and the primary species influencing ozone formation potential exist among these cities.Nanning and Guilin are characterized by high levels of alkenes and reactive aromatics,while Laibin and Guigang are dominated by reactive aromatics and alkanes,and Fangchenggang is marked by propylene and reactive aromatics.As a result,controlling reactive aromatics and low-carbon alkenes emerges as crucial in reducing ozone levels,with specific key species varying by city.

关 键 词：臭氧 挥发性有机物 广西 污染特征 污染成因 

分 类 号：X51[环境科学与工程—环境工程]