Characteristics Of Urban And Rural Air Pollution In Taihang Mountain Area

There are many small and medium-sized cities in Taihang Mountain Area and they are faced with serious air pollution problems.However,there are few studies on the characteristics of urban and rural air pollution and its influencing factors in Taihang mountain area.Taking Laiyuan County as an example,taking SO₂,PM₁₀,PM_2.5,NO₂,CO and O₃ as the main analysis indexes,this paper analyzes the temporal and spatial characteristics of urban and rural air environment quality in Taihang mountain area.Compared with plain cities of the same latitude,the characteristics of urban and rural air pollution in mountainous areas and its relationship with topography and meteorological conditions are studied.The main research results include the following:?1?The air pollution of mountainou area and plain area shows different spatial changing characteristics.Laiyuan areas with serious atmosphere pollution are concentrated in the center of the city,and then the suburbs and villages.The high value area of plain are villages and towns,while the city center often becomes the low value center,which shows the trend that township is higher than city.?2?The air pollution of mountain and plain area shows different characteristics of time variation.From the change of the year,the change trend of each pollutant within the year is roughly the same,that is,the change characteristics of PM₁₀,PM_2.5 and CO within the year are generally in the form of"M",the change characteristics of SO₂ and NO₂ within the year are generally in the form of"V",and the change characteristics of O₃ within the year are generally in the form of"U";From the change of the day,the diurnal variations of PM₁₀,PM_2.5,SO₂ and CO all present a"single peak and double Valley"mode,and the diurnal variations of NO₂ and O₃ all present"U"appears.The time node of the peak value of pollutant concentration pollution,the rising and falling rates are significantly different.?3?Laiyuan country is located in the center of the basin.The blocking of the surrounding mountains makes the weather quiet and stable.Local meteorological conditions such as temperature inversion and valley wind affect the diffusion of air pollution,resulting in serious urban pollution.?4?There is a good relevance between meteorological factors and air pollution factors,which has a significant impact on air pollution.With the increase of wind speed,pollutants are easy to diffuse.The temperature is negatively correlated with other pollution factors except for O₃.When the humidity increases,the control of pollutants should be strengthened.?5?Based on the analysis of the spatial and temporal variation characteristics of air pollution factors,of the influence of topography and meteorology on air pollution and of human activities in Laiyuan County,Baoding City,this paper summarizes the characteristics of air pollution in mountainous counties,and puts forward the preventive measures according to local conditions.