气候变化领域集成服务门户(CCPortal): Chemical characteristics and sources of PM2.5 in Hohhot, a semi-arid city in northern China: insight from the COVID-19 lockdown

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DOI	10.5194/acp-22-12153-2022
	Chemical characteristics and sources of PM2.5 in Hohhot, a semi-arid city in northern China: insight from the COVID-19 lockdown
	Zhou, Haijun; Liu, Tao; Sun, Bing; Tian, Yongli; Zhou, Xingjun; Hao, Feng; Chun, Xi; Wan, Zhiqiang; Liu, Peng; Wang, Jingwen; Du, Dagula
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	12153
结束页码	12166
卷号	22 期号:18 页码:14
英文摘要	A knowledge gap exists concerning how chemical composition and sources respond to implemented policy control measures for aerosols, particularly in a semi-arid region. To address this, a single year's offline measurement was conducted in Hohhot, a semi-arid city in northern China, to reveal the driving factors of severe air pollution in a semi-arid region and assess the impact of the COVID-19 lockdown measures on chemical characteristics and sources of PM2.5. Organic matter, mineral dust, sulfate and nitrate accounted for 31.5 %, 14.2 %, 13.4% and 12.3% of the total PM2.5 mass, respectively. Coal combustion, vehicular emission, crustal source and secondary inorganic aerosols were the main sources of PM2.5 in Hohhot, at 38.3 %, 35.0 %, 13.5 %, and 11.4 %, respectively. Due to the coupling effect of emission reduction and improved atmospheric conditions, the concentration of secondary inorganic components, organic matter and elemental carbon declined substantially from the pre-lockdown (pre-LD) period to the lockdown (LD) and post-lockdown (post-LD) periods. The source contribution of secondary inorganic aerosols increased (from 21.1% to 37.8 %), whereas the contribution of vehicular emission reduced (from 35.5% to 4.4 %) due to lockdown measures. The rapid generation of secondary inorganic components caused by unfavorable meteorological conditions during lockdown led to serious pollution. This study elucidates the complex relationship between air quality and environmental policy.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000855093100001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273486
作者单位	Inner Mongolia Normal University; Inner Mongolia Normal University; Inner Mongolia Normal University
推荐引用方式 GB/T 7714	Zhou, Haijun,Liu, Tao,Sun, Bing,et al. Chemical characteristics and sources of PM2.5 in Hohhot, a semi-arid city in northern China: insight from the COVID-19 lockdown[J],2022,22(18):14.
APA	Zhou, Haijun.,Liu, Tao.,Sun, Bing.,Tian, Yongli.,Zhou, Xingjun.,...&Du, Dagula.(2022).Chemical characteristics and sources of PM2.5 in Hohhot, a semi-arid city in northern China: insight from the COVID-19 lockdown.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(18),14.
MLA	Zhou, Haijun,et al."Chemical characteristics and sources of PM2.5 in Hohhot, a semi-arid city in northern China: insight from the COVID-19 lockdown".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.18(2022):14.