基于AQI-Wavelet的安徽省旅游中心城市空气质量的分析和研究

An Analysis of the Air Quality in Tourist Cities in Anhui Based on AQI-Wavelet Transform

以安徽省4个旅游中心城市蚌埠市、合肥市、芜湖市和黄山市2016年全年366天的空气质量指数AQI为研究对象。运用小波变换对其进行分析,并在Matlab R2012b中采用Db4小波基进行一维小波变换。将4座城市的2016年AQI数据导入小波分析工具箱中。进行小波分解后,得到4组近似信号a4,并对得到的4组近似信号分别分城市和分季度进行分析。结果表明4座城市中黄山市的a4近似信号波动最小且数值最低。其余3座城市季节波动均较大,从而得出黄山市空气质量最优,其次是芜湖市,而合肥市和蚌埠市近似信号波动较大且整体数值较大,空气质量全年总体较差。

The AQI of 366 days in Bengbu City, Hefei City, Wuhu City and Huangshan City in 2016 inAnhui Province is studied using wavelet transform, and Db4 wavelet base is used for one-dimensional wavelettransform in the Matlab R2012b.The AQI data of 4 cities are then introduced into the wavelet analysis toolbox.After the wavelet decomposition, 4 groups of approximate signals a4 are obtained, and the 4 groups ofapproximate signals are analyzed by city and quarter respectively. The results show that the a4 approximate signalfuctuation of Huangshan City is the slightest in the 4 cities while the seasonal fluctuation in the other 3 cities isobvious. Therefore, the air quality is the best in Huangshan City, followed by Wuhu City. The air quality in Hefeiand Bengbu City is generally poor throughout the year, as they have greater approximate signal fluctuations andlarger overall values.