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 |