Changes in Secondary Inorganic Ions in PM 2.5 at Different Pollution Stages Before and After COVID-19 Control

• Published in: Huanjing kexue Vol. 44; no. 5; p. 2430
• Main Authors: Jiang, Nan, Hao, Xue-Xin, Hao, Qi, Wei, Yun-Fei, Zhang, Yu, Lü, Zheng-Qing, Zhang, Rui-Qin
• Format: Journal Article
• Language: Chinese
• Published: China 08.05.2023
• Subjects: Air Pollutants - analysis; Air Pollution - analysis; China - epidemiology; COVID-19 - epidemiology; Environmental Monitoring - methods; Humans; Ions - analysis; Particulate Matter - analysis; Respiratory Aerosols and Droplets; Seasons; China; COVID-19; pollutant gases; different stages of haze; PM2.5; typical water-soluble ions
• ISSN: 0250-3301

To investigate the change characteristics of secondary inorganic ions in PM at different pollution stages before and after COVID-19, the online monitoring of winter meteorological and atmospheric pollutant concentrations in Zhengzhou from December 15, 2019 to February 15, 2020 was conducted using a high-resolution (1 h) online instrument. This study analyzed the causes of the haze process of COVID-19, the diurnal variation characteristics of air pollutants, and the distribution characteristics of air pollutants at different stages of haze.The results showed that Zhengzhou was mainly controlled by the high-pressure ridge during the haze process, and the weather situation was stable, which was conducive to the accumulation of air pollutants. SNA was the main component of water-soluble ions, accounting for more than 90%. Home isolation measures during COVID-19 had different impacts on the distribution characteristics of air pollutants in different haze stages. After COVID-19, the concentration of PM in the clean