The impact of anthropogenic emissions sectors on the weekly cycle of ambient NO2 across China

IF 7.1 2区环境科学与生态学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Environmental Technology & Innovation Pub Date : 2025-05-26 DOI:10.1016/j.eti.2025.104284

Jianbin Gu , Liangfu Chen , Jinhua Tao , Yanfang Tian , Xiaoxia Liang , Shipeng Song , Meng Fan , Yichen Li

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引用次数: 0

Abstract

Nitrogen dioxide (NO₂) mainly originate from anthropogenic activities such as combustion of fossil fuels in road transport, industries, and thermal power plants. Since human activity in industrialized countries in general follows a seven-day cycle, NO₂ emissions are expected to be reduced during weekends (Saturday–Sunday), and thus display a weekly cycle with low levels on weekends and high on weekdays (Monday–Friday). However, as one of the regions suffering serious NO₂ pollution in the world, weekly cycle of China's NO₂ with significant weekend reduction has not been observed by using satellite measurements. In this study we used NO₂ column data from Tropospheric Monitoring Instrument (TROPOMI) and national and provincial statistics traffic and gross domestic product (GDP) data across China to investigate weekly cycle of NO₂ during the coronavirus disease 2019 (COVID-19) lockdown in the first quarter (Q1) of 2020, the subsequent economic recovery period in Q1 2021, and the impact period of the breakout of Omicron in Q1 2022. We find an increase in magnitude of weekend reduction in NO₂ levels by 8 % over China in Q1 2020 compared to Q1 2019 due to the lockdown restrictions, and passenger traveled, freight traveled, and secondary industry contributed 9 %, 66 %, and 25 % to this change, respectively. A decrease in weekend reduction by 7 % in Q1 2021 was observed due to economic stimulus packages issued by governments. Changes in provincial-level weekly cycle of NO₂ were also calculated, as well as the three emission source sectors variations.

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人为排放部门对中国周循环环境NO2的影响

二氧化氮（NO2）主要来源于人为活动，如道路运输、工业和火力发电厂燃烧化石燃料。由于工业化国家的人类活动通常以7天为周期，预计周末（周六至周日）的二氧化氮排放量会减少，因此呈现出周末低水平、工作日（周一至周五）高水平的每周循环。然而，作为世界上NO2污染严重的地区之一，中国NO2的周循环并没有通过卫星观测到明显的周末减少。在本研究中，我们利用对流层监测仪器（TROPOMI）的二氧化氮柱数据以及全国和各省统计交通和国内生产总值（GDP）数据，研究了2020年第一季度（Q1） 2019冠状病毒病（COVID-19）封锁期间的二氧化氮周循环、2021年第一季度随后的经济恢复期以及2022年第一季度欧米克朗爆发的影响期。我们发现，与2019年第一季度相比，由于封锁限制，2020年第一季度中国周末二氧化氮水平下降幅度增加了8. %，乘客旅行、货运旅行和第二产业分别对这一变化贡献了9. %、66. %和25. %。由于政府发布的经济刺激计划，2021年第一季度周末减少了7% %。同时计算了NO2的周循环变化，以及3个排放源行业的变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Environmental Technology & Innovation Environmental Science-General Environmental Science

CiteScore

14.00

自引率

4.20%

发文量

435

审稿时长

74 days

期刊介绍： Environmental Technology & Innovation adopts a challenge-oriented approach to solutions by integrating natural sciences to promote a sustainable future. The journal aims to foster the creation and development of innovative products, technologies, and ideas that enhance the environment, with impacts across soil, air, water, and food in rural and urban areas. As a platform for disseminating scientific evidence for environmental protection and sustainable development, the journal emphasizes fundamental science, methodologies, tools, techniques, and policy considerations. It emphasizes the importance of science and technology in environmental benefits, including smarter, cleaner technologies for environmental protection, more efficient resource processing methods, and the evidence supporting their effectiveness.