成都市空气质量状况研究

Study on Air Quality Index and Individual Air Quality Index in Chengdu City

根据PM2.5数据网提供的成都市2013年9月到2014年10月的数据,对空气质量指数(AQI)和空气质量分指数(IAQI)进行定量化研究。结果表明,AQI的年均值为115,属于轻度污染,空气质量优良天数为187天,占全年的51%。四季空气质量状况由好到差是夏季>秋季>春季>冬季。空气质量白天优于夜晚,O3最高值出现在15∶00时,其他污染物浓度最高出现在23∶00,16∶00—18∶00各种污染物的浓度较低,为运动的最佳时间。PM2.5和PM10的相关系数为0.975,其年平均值分别为82.33μg/m3和126.65μg/m3,在日均值样本中超标率分别达43%和30%,NO2超标率为9%,SO2和CO无超标。

Data in Chengdu were provided by PM2. 5 data network,and it spaned from September 2013 to August 2014,air quality index（ AQI） and individual air quality index（ IAQI） were quantitatively investigated. Results showed that： Annual average value for AQI of 115,belonged to the light pollution and there were 187 days with fairly good air quality,accounting for 51% of the whole year. The order for air quality status in seasons from best to worst was summer,autumn,spring and winter. The air quality in the day time was better than that in the night,and maximum for O3 could reach the peak at 3 pm,for other pollutants at 11 pm. In addition,concentration for all kinds of pollutant was lower between 4 pm and 6 pm. Correlation coefficient between PM2. 5 and PM10 was 0. 975,the annual mean was 82. 33μg / m3 and 126. 65μg / m3,which were 43% and 43% respectively in the daily average,and NO2 exceeded 9% of criterion,SO2 and CO without exceeding standard.