Dust Concentration Distribution And Its Influencing Factors In Wuhai And Surrounding Areas Of Inner Mongolia

In recent years,the scale of urban areas has been expanding,the urbanization process has been increasing year by year,and the industrialization of coal mining has been accelerating,resulting in the increasing emissions of human production,living,transportation and other pollutants into the atmosphere,and the destruction of the atmospheric environment.It is also getting worse.Wuhai City is currently one of the most polluted areas in China.The pollution of dust particles can not be ignored.At present,there are relatively few studies on the comprehensive analysis of dust particle concentration and land use and meteorological topography.In this paper,the dust concentration data is collected by the flow monitoring method.The data processing and analysis are carried out by means of geographic information system.The spatial distribution of dust concentration is analyzed from the three scales of Wuhai and surrounding areas,Wuhai City and Wuhai typical mining area.The dust concentration is combined with land use and meteorological topographic data to explore the relationship between dust concentration and influencing factors.Finally,the impact area of dust particles in the study area is affected.The conclusion is as follows.(1)In the Wuhai and surrounding areas(large scale),it is found that the heavily polluted areas are distributed along the Yellow River in a point-like manner.The pollution near the sand area and the human gathering area is relatively heavy,and the areas with less human activities such as grasslands are less polluted.In the Wuhai city scale(mesoscale),spatial interpolation method was used to find that the dust concentration showed obvious regional differences.The concentration of industrial and mining land and urban areas is higher than that of forested land and unused land.The concentration of cultivated land and water body is the lowest.The industrial and mining land is the main source of summer coarse particulate dust concentration and winter dust concentration in Wuhai City.The town is the main summer fine particle dust in Wuhai.Sources,water bodies,cultivated land,and forested land can significantly reduce the concentration of particulate matter in the air.In the typical mining area(small scale)of Wuhai City,it is found that the concentration of dust within 0-2km is obviously attenuated.The coal mining activities in Wuhai Open-pit Coal Mine generate a large amount of dust particles,centered on the center of the mining area,and the area within 2km radius has the greatest impact on the environment.(2)The relationship between dust concentration and land use factors is obvious.The dust concentration in vegetation cover areas and water areas is low,and the concentration of dust in areas with frequent human activities such as construction areas is high.The winter is most affeected by vegetation,and the summer is most affected by water.Dust concentration is closely related to meteorological topographic factors.Dust concentration is negatively correlated with temperature and altitude,and positively correlated with humidity and air pressure.Among them,humidity is the most important factor affecting PM1-10.(3)In the affected area of dust particles,it can be seen that the overall pollution in Wuhai City is low in summer,and the coarse and fine particles are less.The coarse particles in the Haibowan mining area with a belt-like distribution in the east of the summer are relatively heavy;More serious,the pollution of coarse and fine particles in the western Wuda mining area,the central and southern Hainan mining area and the eastern Haibowan mining area are relatively heavy.It can be seen from the comprehensive evaluation results of dust that the areas with poor air quality in winter are mainly distributed in the eastern Haibowan mining area,the western Wuda mining area and the central and southern Hainan mining area,and the rest are relatively good.The areas with poor air quality in summer are distributed in the western Wuda mining area,the central and southern Hainan mining area,the northern Haibowan urban area and the eastern Haibowan mining area.