Table 3.

Test results of correlation between PM_2.5 levels and people’s emotional intensity.

Explanatory Variable	Explained Variable
	Number of Negative Weibo Posts		Share of Negative Weibo Posts
	Model 1	Model 2	Model 3	Model 4
Weekend	5.8296	3.8199	−0.0289 ***	−0.0294 ***
	(6.5029)	(5.2182)	(0.0071)	(0.0071)
Holiday	−22.1751 **	−44.2820 ***	−0.0270 **	−0.0323 ***
	(9.1351)	(9.0503)	(0.0109)	(0.0111)
Temperature	0.1088	3.3306 ***	−0.0046 ***	−0.0038 ***
	(1.1620)	(1.0039)	(0.0011)	(0.0011)
Square of temperature	−0.1203 ***	−0.1350 ***	0.0001 ***	0.0001 ***
	(0.0327)	(0.0268)	(0.0000)	(0.0000)
Humidity	2.3040 ***	0.5547 ***	0.0009 ***	0.0005 **
	(0.2952)	(0.1722)	(0.0002)	(0.0002)
Precipitation	−1.5675 ***	−0.2797 *	−0.0002	0.0001
	(0.5098)	(0.1575)	(0.0006)	(0.0006)
Sea level pressure	−1.2848 **	1.0594 *	−0.0018 **	−0.0012
	(0.6455)	(0.5485)	(0.0007)	(0.0007)
Wind speed	0.0508	2.7047 ***	−0.0033 ***	−0.0027 ***
	(0.6709)	(0.6352)	(0.0007)	(0.0007)
Major event	−0.2190	0.7872	−0.0150 **	−0.0148 **
	(6.5950)	(5.2985)	(0.0076)	(0.0074)
Spring	−46.7479 ***	−58.0878 ***	0.0091	0.0064
	(12.5696)	(10.9529)	(0.0111)	(0.0109)
Summer	−78.2494 ***	−38.8843 ***	−0.0422 **	−0.0327 *
	(15.2589)	(11.2806)	(0.0175)	(0.0172)
Autumn	−41.8634 ***	−11.4606	−0.0220 **	−0.0146
	(14.8600)	(11.0593)	(0.0093)	(0.0094)
PM2.5		1.0168 ***		0.0002 ***
		(0.0935)		(0.0000)
R2	0.3343	0.5792	0.1368	0.1509

Note: The values in the table represent the correlation coefficients of the variables of the regression model, and the standard error of each coefficient is in parentheses. ***, **, * indicate significance at the levels of 0.01, 0.05 and 0.1, respectively. Winter is the default variable.