Preprints
https://doi.org/10.5194/acp-2022-283
https://doi.org/10.5194/acp-2022-283
 
30 May 2022
30 May 2022
Status: this preprint is currently under review for the journal ACP.

Chemical Characteristics and Source of PM2.5 in Hohhot, a Semi-arid City in Northern China: Insight from the COVID-19 Lockdown

Haijun Zhou1,2,3,, Tao Liu4,, Bing Sun5, Yongli Tian4, Xingjun Zhou4, Feng Hao4, Xi Chun1,2,3, Zhiqiang Wan1,2,3, Peng Liu1, Jingwen Wang1, and Dagula Du6 Haijun Zhou et al.
  • 1College of Geographical Sciences, Inner Mongolia Normal University, Hohhot 010022, China
  • 2Provincial Key Laboratory of Mongolian Plateau’s Climate System, Inner Mongolia Normal University, Hohhot 010022, China
  • 3Inner Mongolia Repair Engineering Laboratory of Wetland Eco-environment System, Inner Mongolia Normal University, Hohhot 010022, China
  • 4Environmental Monitoring Center Station of Inner Mongolia, Hohhot 010011, China
  • 5Hohhot Environmental Monitoring Branch Station of Inner Mongolia, Hohhot 010030, China
  • 6Environmental Supervision Technical Support Center of Inner Mongolia, Hohhot 010011, China
  • These authors contributed equally to this work.

Abstract. 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 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 emissions, crustal sources, 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, elemental carbon, and chloride declined from the pre-lockdown period to the lockdown and post-lockdown period. Compared with the pre-lockdown period, the percentage of secondary inorganic components declined during the lockdown and post-lockdown period, while the mineral dust, organic matter, and elemental carbon increased. 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.

Haijun Zhou et al.

Status: open (until 11 Jul 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-283', Anonymous Referee #1, 13 Jun 2022 reply
  • RC2: 'Comment on acp-2022-283', Anonymous Referee #2, 23 Jun 2022 reply

Haijun Zhou et al.

Haijun Zhou et al.

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Short summary
A single year’s offline measurement was conducted in Hohhot to reveal the chemical characteristics and sources of PM2.5 in a semi-arid region. We believe that our study makes a significant contribution to the literature because relatively few studies have focused on the chemical composition and sources of PM2.5 with offline measurements. A knowledge gap exists concerning how chemical composition and sources respond to implemented control measures for aerosols, particularly in a semi-arid region.
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