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. 2020 Aug 21;28(1):775–788. doi: 10.1007/s11356-020-10483-y

Table 4.

Robustness of AQI

AQI_E
(1) (2) Wuhan Chengdu Zhengzhou Taiyuan
E

− 0.5287

(5.1106)

− 14.6474***

(4.7828)

− 11.2752**

(4.4422)

26.9558***

(9.5880)

− 12.1640

(11.0530)

− 11.1972

(9.1531)

N 840 627 210 213 207 210
R2 0.3753 0.3801 0.4748 0.5524 0.4436 0.4067

Note: (1) is the full sample regression result and (2) deletes the data of Chengdu. *, **, and *** respectively indicate significance levels of 10%, 5%, 1%