内蒙古自治区环境空气质量状况分析

ANALYSIS OF AMBIENT AIR QUALITY IN INNER MONGOLIA

根据内蒙古自治区2006-2013年12个地级城市的空气质量监测数据,采用Spearman秩相关系数法,分析了全区及各城市二氧化硫（SO_2）、二氧化氮（NO_2）及可吸入颗粒物（PM_（10））3项大气污染物年均浓度的达标情况及变化趋势,得出了相应的空气质量级别,对内蒙古自治区的空气质量现状进行了评价。结果表明：8年间,内蒙古自治区总体的空气质量有所好转,SO_2、PM_（10）的年均浓度均呈下降趋势,污染明显减轻;NO_2的年均浓度变化趋势不明显,也均无超标情况。12个城市各年度的空气质量达标率在33.3-91.7%之间,呼和浩特、包头和乌海3个城市的空气质量较差,需进一步改善,其它城市的空气质量均有所好转。

The demonstrating compliance and change trends of three major air pollutions, sulfur dioxide （SO2 ）, nitrogen dioxide （NO2 ） and particulate matter （PM10） at annual average concentration were analisised, air quality was evaluated and the levels of were determined base on datas of tested air quality in Inner Mongolia from 2006 to 2013 using the spearman＇s rank correlation coefficient method. In results, the overall air quality was improved in these eight years in Inner Mongolia. The annual concentration of SO2, PM10were significantly decreased; The annual concentration of NO2 did not obviously change and exceed the standed. The air quality in 12 cities of Inner Mongolia at 33.3% to 91.7% reached the standard within eight years. The air quality of Hohhot, Baotou and Wuhai were bad, others were better.