Analysis of the Influence of Precipitation and Wind on PM2.5 and PM10 in the Atmosphere

Zhen Liu,Chengyu Yan,Jianshuang Du,Luming Shen,Yang Li,Hui Zhao

doi:10.1155/2020/5039613

Abstract

In this paper, hourly observations of precipitation, wind, and PM2.5 and PM10 concentrations in Qinhuangdao from 2016 to 2018 were used to study the effects of precipitation and wind on PM2.5 and PM10 concentrations. The results show that precipitation has a certain wet scavenging effect on PM2.5 and PM10, and the scavenging effect on PM10 is greater than that on PM2.5. Precipitation above moderate rainfall is concentrated from May to September, and light rain in winter increases the concentration of pollutants. The changes of PM2.5 before and after precipitation are related to the initial concentration of PM2.5 before precipitation, precipitation intensity, and precipitation duration. The scavenging effect of precipitation on PM10 is closely related to the initial concentration of PM10 before precipitation. The higher the initial concentration of PM10 is, the greater the removal amount of precipitation will be. Moderate or above pollution weather mainly occurs in the northeast, southwest, and west wind meteorological conditions; the more westerly the wind, the more the pollution; north wind and northwest wind have the most obvious scavenging effect on PM2.5 and Pm10; when the wind speed increases to 2 m/s, the concentration of PM2.5 and PM10 can be reduced; when the wind speed is more than 4 m/s, the concentration of PM10 increases under the south wind, southeast wind, east wind, and northeast wind.

Highlights

With the rapid development of industrialization, social economy, and the increasing number of motor vehicles, the problem of urban air pollution has become more and more serious, which has become an important factor restricting the construction of urban ecological civilization [1, 2]
Atmospheric particulate matter mainly includes particulate matter PM2.5 and PM10, and the excessive concentration of particulate matter has become a prominent problem in the air quality of many cities in China [3,4,5,6,7]
It will reduce the visibility of the atmosphere, cause harm to human body, and may lead to diseases related to heart and lung dysfunction [8, 9]. erefore, the research on management of PM2.5 and PM10 has become a hot topic in recent years

Summary

Introduction

With the rapid development of industrialization, social economy, and the increasing number of motor vehicles, the problem of urban air pollution has become more and more serious, which has become an important factor restricting the construction of urban ecological civilization [1, 2]. Atmospheric particulate matter mainly includes particulate matter PM2.5 (the particulate matter with aerodynamic diameter less than or equal to 2.5 μm) and PM10 (the particulate matter with aerodynamic diameter less than or equal to 10 μm), and the excessive concentration of particulate matter has become a prominent problem in the air quality of many cities in China [3,4,5,6,7]. When the pollution source is relatively stable, the influence of meteorological conditions on particle concentration plays a leading role [25, 26] Both of them affect the wet removal process and dry removal process of particulate matter, respectively, which is an important process to maintain the balance of the source and sink suspended particles in the atmosphere and the self-cleaning. It provides a reference basis for the further improvement of air pollution forecast, warning, and prevention

Data and Methods

Results and Discussions

Conclusion