许昌城区大气污染物变化特征及其影响要素研究

Study on the Variation Characteristics of Air Pollutants and Their Influencing Factors in Xuchang Urban Area

通过研究2016-2018年许昌城区大气污染物变化特征及其影响要素,得出以下结论。①2016-2018年许昌城区大气颗粒物污染情况有所好转,达标率逐年降低。②月均浓度呈“V”型变化。季节变化表现为冬季浓度最高,夏季浓度最低,PM_(10)春季浓度高于秋季。PM_(2.5)平均浓度日变化呈单峰单谷型,PM_(10)平均浓度日变化呈双峰双谷型。③PM_(2.5)浓度主要与气温呈负相关;PM_(2.5)、PM_(10)浓度与降水量呈负相关;PM_(2.5)浓度与相对湿度在春、冬季呈正相关,夏季呈负相关;PM_(10)浓度和相对湿度主要呈负相关;PM_(2.5)、PM_(10)浓度与风速均呈负相关。

By studying the variation characteristics and influencing factors of atmospheric pollutants in Xuchang urban area from 2016 to 2018, it can be concluded that:(1)The atmospheric particulate pollution in Xuchang urban area improved from 2016 to 2018, and the compliance rate decreased year by year.(2)The monthly mean concentration showed a V-shaped change. The seasonal variation showed that the concentration was the highest in winter and the lowest in summer. The concentration of PM_(10)in spring was higher than that in autumn. The diurnal variation of PM_(10)concentration showed double peaks and double valleys.(3) The concentration of PM_(2.5)was negatively correlated with air temperature.PM_(2.5)and PM_(10)concentration were negatively correlated with precipitation. The concentration of PM_(2.5)was positively correlated with relative humidity in spring and winter, but negatively correlated with relative humidity in summer. PM_(10)concentration was negatively correlated with relative humidity. PM_(2.5)and PM_(10)concentrations were negatively correlated with wind speed.