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在2014-2022年期间,中国不同地区的PM_2.5的多时间尺度变化特征在2014-2022年期间

Rui Liu¹, Min Shao², Qin'geng Wang³

¹State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Nanjing 210023, China.

The Science of the total environment

|February 18, 2024

概括

中国显著减少了PM2.5污染,但区域差异仍然存在. 空气质量控制工作是有效的,但控制作物残留物燃烧,尘埃和夜间排放对于特定地区至关重要.

科学领域:

环境科学环境科学
大气化学大气化学
空气质量管理管理空气质量

背景情况:

在过去的十年中,中国在降低细颗粒物 (PM2.5) 度方面取得了重大进展.
在PM2.5趋势和贡献因素中存在显著的区域差异仍未得到充分研究.

研究的目的:

从2014年到2022年,全面分析中国各大地区PM2.5度的年度,季节性和日间变化特征.
确定驱动因素,评估空气污染控制的有效性,并考虑到区域差异,讨论未来的优先事项.

主要方法:

从2014年到2022年每小时PM2.5度数据的分析.
在年度,季节性和日间尺度上检查PM2.5变化趋势.
专注于变异特征的区域差异以及作物残留物燃烧和尘埃事件等促成因素.

主要成果:

所有地区的年度PM2.5都呈现下降趋势,但下降率有很大差异.
季节性下降率在区域上有所不同,受农作物残留物燃烧 (中国东北部) 和尘埃事件 (中国北部/西部) 的影响.
夜间PM2.5度通常超过白天水平,在白天/夜间比率上有明显的区域跨年趋势.

结论:

空气污染控制措施在很大程度上取得了成功,但区域差异很大.
需要有针对性的战略来解决区域问题,包括作物残留物燃烧,尘埃事件和夜间排放量的增加.

关键词:

改善空气质量的改善微细颗粒物质的细颗粒物质的细颗粒物质污染控制政策污染控制政策时间空间的变化.

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