Sudden pollution incidents around Beijing on a crisp October day: Insights from capturing pollution conveyor belts

Abstract

North China Plain, an area is usually sunny and cloudless in autumn, rare heavy pollution suddenly occurred around Beijing. This is a new focus of public attention and research. Since late October 2023, it has caused sudden haze pollution. This study focuses on capturing the mechanisms behind sudden pollution in clear skies, tracking the establishment and transmission of adverse weather conditions, focusing on targeted key stations affected by adverse weather. Revealing the correlation between implicit multiple types of precursor meteorological signals: atmospheric boundary layer, condensation rate threshold, in the atmosphere. Obtain the coupling point of the interaction and matching between micro-scale disturbances and weather-scale fluctuations, and reveal its driving mechanism behind sudden pollution in clear skies. The novelty of this study lies in targeting regions that have achieved certain success in emission reduction. Provide insights into the "feedback" effects that adverse weather conditions can cause. It particularly provides a further understanding of the interactions between clouds, aerosols in the “pollution conveyor belt” and provides quantitative indicators for early warning. Provide quantitative technical support for developing accurate response measures in air quality research.