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| DOI：doi:10.7515/JEE201205015 |
| CSTR：32259.14.JEE201205015 |
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| The air pollution changes of Guanzhong cities in the recent 30 years and the controls |
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ZHOU Ni, ZHAO Jing-bo1,2
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1.College of Tourism and Environment, Shaanxi Normal University, Xi′an 710062, China;2.State Key Laboratory of Loess and Quatemary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi′an 710075, China
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