Table 7 Explained variable substitution test.
Variables | PM2.5 (1) | PM10 (2) | SO2 (3) | CO (4) | NO2 (5) | O3 (6) |
|---|---|---|---|---|---|---|
the establishment of GFRIs | −4.8470*** (−4.2618) | −5.9872*** (−3.7963) | −6.73072*** (−12.489) | −0.0570*** (−3.0556) | −1.1028* (−1.8393) | −7.6199*** (−3.9157) |
Control variables | Y | Y | Y | Y | Y | Y |
Fixed effect | Y | Y | Y | Y | Y | Y |
Obs | 7236 | 7236 | 7236 | 7236 | 7236 | 7236 |
R2 | 0.6980 | 0.6675 | 0.5315 | 0.5792 | 0.7353 | 0.5076 |
