Characteristics and Meteorological Causes of a Moderate Haze Pollution Process in Zhejiang Province in December 2023
Pu Jingjiao
Niu Yuwen
Li Minjie
Hu Yongliang
Zhu Chize
Abstract：From December 28,2023 to January 2,2024,Zhejiang province experienced a moderate haze pollution process,which was the strongest and longest lasting haze process since 2018.Using the air quality data and meteorological data of the same period,the weather patterns,air mass transport charac-teristics and meteorological causes of this haze process were studied.The results showed that surface me-teorological conditions such as warming,humidifying,continuous low wind speed(<2 m/s),and no precipitation,as well as long duration and strong vertical inversion(inversion intensity reaching the peak value of 2.28℃/100m),and static weather conditions controlled by uniform pressure field or high pres-sure bottom,resulted in adverse meteorological conditions that led to local pollution accumulation.The contribution of local emissions in Zhejiang province reached as high as 47%,which was the main cause of this haze process.Owing to the implementation of the Action Plan for Air Pollution Prevention and Con-trol,the number of days with moderate or more severe pollution events in Zhejiang has significantly de-creased,but adverse meteorological conditions might still cause local particulate matter pollution,leading to prolonged haze weather processes in Zhejiang.
Keywords：hazemoderate pollutionmeteorological causesair mass transportZhejiang
Publication Date：2026-03-30
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：9( 41-49 )