中文摘要：

空气污染指数（API）用于表征区域空气污染程度和质量状况,其变动存在长期趋势、季节效应及随机扰动效应等特征。为探索API的波动规律,以武汉市2001—2012年API为例,进行X-12-ARIMA季节调整方法下的API演变趋势及内在规律探究。结果表明：在研究期内,武汉市API的变化受趋势成分的影响作用为85.2%;API月度及季节性变化显著;冬、春季节空气质量较差且变化不规则。最后,依据研究结果为武汉市空气环境质量的改善提出了建议。

英文摘要：

Abstract： As the key indicator of regional air pollution degree and the quality,Air Pollution Index （API） not only had long-term trend, seasonal effect, but also had its random disturbance effect. The Evolution tendency and in- ternal regularity of API in Wuhan from 2001 to 2012 had been analyzed by using the X-12-ARIMA method. The re- sults showed that：the change of Wuhan API affected by the trend components was 85.2% in the study period,API monthly and seasonal change was obvious. The air quality was poor and irregular in winter and spring. In the end, some reasonable suggestions were put forward for improving the environment quality of Wuhan according to the re- sults of study.