摘要
为评估成都大运会期间大气污染管控政策减排效果及其对PM_(2.5)理化特征和来源的影响,于2023年夏季对成都大气PM_(2.5)进行了连续采样与分析.根据管控政策实施节点,整个观测时段可分为管控前(7月8日—21日)、常规管控期P1(7月22日—25日和7月30日—8月10日)、加强管控期P2(7月26日—29日)和管控结束(8月11日—26日).结果表明,管控政策的实施对于各类污染物减排效果明显.相比管控前,PM_(2.5)、NO_(2)和O_(3)浓度在P2阶段分别下降了56.2%、42.6%和34.9%;同时,POC/OC比值从管控前的0.6降至P2阶段的0.3,而SOC/OC比值则从0.4升至0.7,一次源减排效果显著.水溶性无机离子中,相比管控前,P2阶段SO_(4)^(2-)、NO_(3)^(-)、NH_(4)^(+)浓度分别下降了59.9%、66.2%和60.2%.管控结束后各组分浓度反弹明显.PM_(2.5)主要来源包括移动源(40.6%)、扬尘源(16.7%)、二次硫酸盐与生物质燃烧复合源(23.1%)、二次硝酸盐源(13.3%)及燃煤源(6.3%).受各阶段不同源管控强度的变化,各源的相对贡献呈现出了差异化的变化特征.其中,移动源在P1阶段最高,为47.9%;扬尘源和二次硫酸盐与生物质燃烧复合源在P2阶段最高,分别为22.1%和26.0%;二次硝酸盐和燃煤源贡献则因管控结束后相关排放行业的快速恢复生产而在管控结束后达到最高,分别为16.7%和8.7%.管控前PM_(2.5)潜在源高值区广泛分布于成都以东和川渝交界地区,管控期间潜在源区范围及贡献强度减弱,但管控结束后出现反弹.
To evaluate the emission reduction effects of air pollution control policies during the Chengdu Universiade and their impact on the physicochemical characteristics and sources of PM_(2.5),the continuous sampling and analysis of atmospheric PM_(2.5) in Chengdu were conducted during the summer of 2023.Based on the implementation timeline of the control policies,the entire observation period was divided into pre-control period(July 8—July 21),regular control period P1(July 22—July 25 and July 30—August 10),enhanced control period P2(July 26—July 29),and post-control period(August 11—August 26).The results indicated that the implementation of the control policies significantly reduced various pollutants.Compared to the pre-control period,the concentrations of PM_(2.5),NO_(2),and O_(3) decreased by 56.2%,42.6%,and 34.9%,respectively,during P2.Meanwhile,the POC/OC ratio decreased from 0.6 in the pre-control period to 0.3 in P2,while the SOC/OC ratio increased from 0.4 to 0.7,demonstrating significant emission reduction effects from primary sources.Among water-soluble inorganic ions,compared to the pre-control period,the concentrations of SO_(4)^(2‒),NO_(3)^(‒),and NH_(4)^(+)decreased by 59.9%,66.2%,and 60.2%,respectively,during P2.A notable rebound in the concentrations of pollutants was observed during the post-control period.The main sources of PM_(2.5) included mobile sources(40.6%),dust sources(16.7%),composite source of secondary sulfate and biomass burning(23.1%),secondary nitrate sources(13.3%),and coal combustion sources(6.3%).Due to the differences in the intensity of control over different sources in each period,the relative contributions of these sources exhibited differentiated trends.Specifically,mobile sources peaked during P1 at 47.9%,dust sources and composite source of secondary sulfate and biomass burning reached their highest levels during P2 at 22.1%and 26.0%,respectively.In contrast,the contributions of secondary nitrate and coal combustion sources peaked during the post-control period at 16.7%and 8.7%,respectively,due to the rapid resumption of production in related industries.Before the control period,the high-potential source areas of PM_(2.5) were widely distributed east of Chengdu and along the Sichuan-Chongqing border.During the control period,the scope and contribution intensity of potential source areas weakened,but a rebound occurred during the post-control period.
作者
彭小雪
龙宇涵
刘思雨
姚逊哲
傅心怡
何仁江
史凯
张军科
PENG Xiaoxue;LONG Yuhan;LIU Siyu;YAO Xunzhe;FU Xinyi;HE Renjiang;SHI Kai;ZHANG Junke(School of Environmental Science and Engineering,Southwest Jiaotong University,Chengdu 611756;Environmental Health Effects and Risk Assessment Key Laboratory of Luzhou,School of Public Health,Southwest Medical University,Luzhou 646000;College of Environmental Sciences and Engineering,China West Normal University,Nanchong 637009)
出处
《环境科学学报》
北大核心
2026年第1期228-238,共11页
Acta Scientiae Circumstantiae
基金
四川省自然科学基金(No.2024NSFSC0060)
国家自然科学基金(No.U23A2030)
泸州市人民政府-西南医科大学科技战略合作项目(No.2023LZXNYDJ050)。
