Table 2.
Baseline regression for full samples.
| Variables | (1) Ln(AQI) |
(2) Ln(SO2) |
(3) Ln(PM2.5) |
(4) Ln(PM10) |
(5) Ln(NO2) |
(6) Ln(CO) |
|---|---|---|---|---|---|---|
| Lockdown | −0.0780⁎⁎⁎ (−6.0266) |
−0.0676⁎⁎⁎ (−6.0003) |
−0.0593⁎⁎⁎ (−4.1475) |
−0.1366⁎⁎⁎ (−10.2586) |
−0.2467⁎⁎⁎ (−13.8099) |
−0.0458⁎⁎⁎ (−3.3007) |
| Lowtem | 0.0134⁎⁎⁎ (4.9654) |
−0.0113⁎⁎⁎ (−4.2123) |
0.0161⁎⁎⁎ (5.1485) |
0.0113⁎⁎⁎ (3.8673) |
−0.0054⁎ (−1.9692) |
0.0102⁎⁎⁎ (4.3940) |
| Hightem | 0.0096⁎⁎⁎ (5.4290) |
0.0268⁎⁎⁎ (8.5394) |
0.0067⁎⁎⁎ (3.0368) |
0.0175⁎⁎⁎ (7.9743) |
0.0173⁎⁎⁎ (9.8751) |
0.0074⁎⁎⁎ (4.4136) |
| D. meantem | 0.0207⁎⁎⁎ (5.2470) |
0.0155⁎⁎⁎ (3.7546) |
0.0320⁎⁎⁎ (5.7489) |
0.0229⁎⁎⁎ (5.7645) |
0.0239⁎⁎⁎ (5.6181) |
0.0160⁎⁎⁎ (3.7053) |
| Maxwind | −0.0022 (−1.5579) |
−0.0006 (−0.3758) |
−0.0012 (−0.6222) |
−0.0024 (−1.4255) |
−0.0008 (−0.3962) |
0.0012 (0.6670) |
| Maxgust | −0.0063⁎⁎⁎ (−6.3484) |
−0.0062⁎⁎⁎ (−4.9933) |
−0.0124⁎⁎⁎ (−10.6413) |
−0.0062⁎⁎⁎ (−5.0850) |
−0.0087⁎⁎⁎ (−7.8728) |
−0.0086⁎⁎⁎ (−7.6721) |
| Rain | 0.0054 (0.2743) |
−0.0912⁎⁎⁎ (−3.2911) |
0.0508⁎ (1.8673) |
−0.0214 (−0.9028) |
0.0131 (0.6053) |
0.0606⁎⁎⁎ (4.3119) |
| Snow | −0.0914⁎⁎⁎ (−3.7358) |
−0.0482 (−1.2432) |
−0.1193⁎⁎⁎ (−3.4968) |
−0.1686⁎⁎⁎ (−6.4629) |
0.0261 (0.8012) |
0.0101 (0.3582) |
| Timetrend | −0.0075⁎⁎⁎ (−10.7262) |
−0.0065⁎⁎⁎ (−7.5435) |
−0.0101⁎⁎⁎ (−12.8593) |
−0.0072⁎⁎⁎ (−8.4292) |
−0.0036⁎⁎⁎ (−6.8208) |
−0.0094⁎⁎⁎ (−11.9917) |
| Lag length (p) | 2 | 3 | 4 | 4 | 3 | 4 |
| City fixed effects | Yes | Yes | Yes | Yes | Yes | Yes |
| Constants | 2.8751⁎⁎⁎ (32.8429) |
1.3936⁎⁎⁎ (16.4894) |
3.1002⁎⁎⁎ (37.2285) |
2.8735⁎⁎⁎ (31.1057) |
1.7736⁎⁎⁎ (14.4715) |
0.4806⁎⁎⁎ (19.0019) |
| Sample size | 3476 | 3432 | 3388 | 3388 | 3432 | 3388 |
| R2 | 0.6218 | 0.6721 | 0.6514 | 0.5832 | 0.6895 | 0.6655 |
Note: t statistics in parentheses, standard errors are clustered at city level (44 clusters). ⁎p < .10 indicates significance at 10% levels. ⁎⁎⁎p < .01 indicates significance at 1% levels.