呼和浩特市PM_(2.5)和PM_(10)污染特征与相关性分析

Analysis on the characteristics and trends of PM_(2.5) and PM_(10) pollution in Hohhot

本文分析探究了2016—2018年呼和浩特市PM_(2.5)与PM_(10)质量浓度的时间变化污染特征和趋势。结果表明:2016—2018年呼和浩特市的PM_(2.5)与PM_(10)质量浓度时刻变化均呈现"双峰双谷"字型;月变化趋势略有不同,PM_(2.5)呈"单峰单谷"字型,最大值为65μg/m^(3),最小值为21μg/m^(3),PM_(10)呈"双峰单谷"型,最大值为141μg/m^(3),最小值为53μg/m^(3);季节变化呈不同趋势,PM_(2.5)为冬、秋季高,春季次之,夏季最低;PM_(10)为春、冬季高,秋季次之,夏季最低;PM_(2.5)/PM_(10)的平均值为41%。对PM_(2.5)与PM_(10)季均值进行线性拟合,PM_(2.5)与PM_(10)的相关系数关系为秋季(0.9008)>r冬季(0.8557)>r夏季(0.8230)>r春季(0.7242),秋季和冬季的相关性明显大于夏季和春季。PM_(2.5)的年均质量浓度总体呈先上升后下降趋势,PM_(10)的年均质量浓度总体呈上升趋势。

The pollution characteristics and correlation between PM_(2.5)and PM_(10)mass concentration in Hohhot from 2016 to 2018 were analyzed and explored.The results showed that:the concentration of PM_(2.5)and PM_(10)in Hohhot showed double peaks and double valleys from 2016 to 2018;the monthly change trend is slightly different,PM_(2.5)is single peak and single valley,the maximum value is 65μg/m^(3)and the minimum value is 21μg/m^(3),PM_(10)is of the type of"double peak and single valley"with the maximum value is 141μg/m^(3)and the minimum value is 53μg/m^(3);seasonal changes show different trends,PM_(2.5)is higher in winter and autumn,followed by spring and lowest in summer;PM_(10)is higher in spring and winter,followed by autumn and the lowest in summer;the average PM_(2.5)/PM_(10)is 41%.The seasonal mean of PM_(2.5)and PM_(10)was fitted linearly,the correlation coefficient between PM_(2.5)and PM_(10)was rautumn(0.9008)>rwinter(0.8557)>rsummer(0.8230)>rspring(0.7242),the correlation between autumn and winter is significantly greater than that between summer and spring.The average annual mass concentration of PM_(2.5)increased first and then decreased,and the average annual mass concentration of PM_(10)increased.