变量

被解释变量：ln (density)

(1)

(2)

(3)

lnPM2.5

−0.0711^***

−0.0587^***

−0.0588^***

(0.0129)

(0.0143)

(0.0150)

City characteristics

N

Y

Y

Industrial pollutant emissions

N

N

Y

Constant

5.9895^***

6.0355^***

6.0574^***

(0.0467)

(0.0970)

(0.1063)

Observations

1704

1410

1387

R-squared

0.9991

0.9993

0.9993