山西省主要城市的空气质量长期变化特征研究

利用了2007年－2012年山西省11个城市的空气质量日报资料对空气质量的变化特征及其影响因素进行了研究分析。结果表明，太原市API指数累年平均值最大，长治市和忻州市最小；就年际变化而言，6年来，太原市API指数呈逐年下降趋势，其他城市在2011年－2012年均有不同程度的回升。空气质量的季节变化特征为夏季较好，冬季较差；各城市的首要污染物均为可吸入颗粒物。以山西省大气污染防治重点控制区太原市为例，探讨了空气质量的可能影响因素。

Long-term Variations of Air Quality in Shanxi Province

Long-term variations of air quality and its influencing factors in Shanxi Province were analyzed based on the daily air quality date from 2007 to 2012.The results showed that, the mean of air pollution index(API)in Taiyuan was the highest, the lowest were in Changzhi and Xinzhou.During the 6 years, a significant decreasing trend of API occurred in Taiyuan, however, the API of another cities had rebound from 2011 to 2012.The seasonal change of API in all cities are high in winter and low in summer.The primary polluent in all the cities was respirable particulate matter.This paper discussed the factors that may affect API by taking Taiyuan as an example.