Research Article
Using the Quarterly Compound Fractional Grey Model to Predict the Air Quality in 22 Cities of China
| Anyang | Baoding | Yuncheng | Linyi |
| Jiaozuo | Handan | Jinzhong | Liaocheng | Hebi | Xingtai | Zibo | Xianyang | Xinxiang | Tangshan | Zaozhuang | Xian | Zhengzhou | Jincheng | Jinan | Weinan | Luoyang | Yangquan | ā | ā |
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