Appendix Table 4.

Conventional restriction and the one caused by the COVID-19

	AQI	PM2.5	PM10	CO	NO2	SO2	O3
	(1)	(2)	(3)	(4)	(5)	(6)	(7)
Conventional restriction	−0.044	−0.108	−0.089	−0.037	−0.038	−0.048	−0.046
	(0.086)	(0.110)	(0.092)	(0.041)	(0.067)	(0.062)	(0.068)
R2	0.523	0.576	0.591	0.567	0.771	0.459	0.717
Observations	3228	3228	3228	3228	3228	3228	3228
Restriction caused by the COVID-19	−0.224∗∗	−0.382∗	−0.368∗∗	−0.294∗∗	−0.230∗	−0.033	−0.021
	(0.091)	(0.178)	(0.152)	(0.130)	(0.121)	(0.063)	(0.065)
R2	0.705	0.747	0.740	0.529	0.798	0.520	0.827
Observations	2090	2090	2090	2090	2090	2090	2090
Weather Control	Y	Y	Y	Y	Y	Y	Y
City FE	Y	Y	Y	Y	Y	Y	Y
Date FE	Y	Y	Y	Y	Y	Y	Y

Notes: The observations do not contain control group. All models control for city and day fixed effects. Robust standard errors are reported in parentheses. ∗, ∗∗, and ∗∗∗ indicate significance levels at 10%, 5%, and 1%, respectively.