摘要
本研究对2014年、2018年、2021年京津冀地区典型城市PM_(2.5)与PM_(1)进行样品采集,对不同减排阶段的空气质量改善成效和组分变化开展研究分析.结果表明,大气污染防治行动计划期间,京津冀地区PM_(2.5)浓度与重污染天数持续降低,各城市PM_(2.5)浓度改善幅度为23%~51%,重污染天数下降率为50%~73%,北京、石家庄的SO_(4)^(2-)组分占比分别下降1.9%、1.0%,NO_(3)^(-)组分占比分别上升2.9%、5.4%;“蓝天保卫战”阶段京津冀地区PM_(2.5)浓度改善幅度为21%~35%,北京SO_(4)^(2-)和NO_(3)^(-)浓度下降,但占比分别上升3.5%、1.0%,石家庄SO_(4)^(2-)、NO_(3)^(-)浓度和占比均下降,占比分别下降1.1%、1.5%.北京、石家庄PM_(1)与PM_(2.5)浓度变化趋势相似,北京夏、秋、冬季PM_(1)中二次组分(SOA与SNA)的占比均高于PM_(2.5)中二次组分占比,且在灰霾天气较多的冬季占比最大.基于浓度权重轨迹分析方法(CWT)分析污染输送对两城市颗粒物的潜在影响,发现北京主要受西南传输通道和近周边地区传输影响,石家庄主要受京津冀近周边地区影响.
In this study,samples of PM_(2.5) and PM_(1) were collected from typical cities in the Beijing-Tianjin-Hebei region in 2014,2018,and 2021,and the effectiveness of air quality improvement and changes in components at different stages of emission reduction were studied and analyzed.The results show that during the air pollution prevention and control action plan,the PM_(2.5) concentration and the number of heavily polluted days in the Beijing-Tianjin-Hebei region continued to decrease,and the PM_(2.5) concentration of each city improved by 23%~51%,and the number of heavily polluted days decreased by 50%~73%,and the SO_(4)^(2-)component ratio in Beijing and Shijiazhuang decreased by 1.9%and 1.0%,respectively,and NO_(3)^(-)component ratio increased by 2.9%and 5.4%,respectively,the improvement of PM_(2.5) concentration in Beijing-Tianjin-Hebei region during the stage of blue sky defense is 21%~35%,SO_(4)^(2-)and NO_(3)^(-)ion concentration in Beijing decreased,but the percentage increased by 3.5%and 1.0%,respectively,and the concentration and percentage of SO_(4)^(2-)and NO_(3)^(-)ions in Shijiazhuang decreased,and the percentage decreased by 1.1%and 1.5%,respectively.The PM_(1) concentrations in Beijing and Shijiazhuang had similar trends with PM_(2.5),and the proportion of secondary components(SOA and SNA)in PM_(1) was higher than that of PM_(2.5) in Beijing in summer,fall,and winter,and the proportion was largest in the winter,when there were more hazy weather.Based on the concentration weighted trajectory(CWT)analysis method to analyze the potential impacts of pollution transport on particulate matter in the two cities,Beijing is mainly affected by the southwest transmission corridor and near-periphery transmission,and Shijiazhuang is mainly affected by the near-periphery of Beijing-Tianjin-Hebei.
作者
强宇尧
王晓琦
王传达
何帅龙
程水源
QIANG Yuyao;WANG Xiaoqi;WANG Chuanda;HE Shuailong;CHENG Shuiyuan(Key Laboratory of Beijing on Regional Air Pollution Control,College of Environmental Science and Engineering,Beijing University of Technology,Beijing 100124)
出处
《环境科学学报》
CAS
CSCD
北大核心
2024年第8期22-34,共13页
Acta Scientiae Circumstantiae
基金
国家自然科学基金重点项目(No.52330002)。
作者简介
强宇尧(1993-),男,E-mail:qiangyy@emails.bjut.edu.cn;王晓琦,E-mail:wangxq@bjut.edu.cn。
