Table 3. Regression results of per capita form and intensive form.

Variables	lnSO2	lnCOD	lnSO2	lnCOD
	per capita form	per capita form	intensive form	intensive form
	FE	FE	FE	FE
Index	‒0.0575*** (3.14)	‒0.0543*** (6.67)	‒0.1102*** (5.29)	‒0.1071*** (9.85)
PGDP	0.1845*** (3.96)	0.1350*** (6.51)	‒0.2445*** (4.61)	‒0.2940*** (10.63)
PGDP2	‒0.0189*** (7.10)	‒0.0131*** (11.07)	0.0026 (0.89)	0.0084*** (5.36)
Theil	1.7261*** (4.18)	0.7160*** (3.90)	2.0283*** (4.32)	1.0183*** (4.16)
Industry	0.0619* (1.80)	0.0534*** (3.48)	0.0150 (0.38)	0.0064 (0.32)
Constant	‒4.8400*** (30.08)	‒4.4385*** (62.00)	‒5.9000*** (32.24)	‒5.4985*** (57.58)
R-squared	0.8074	0.9192	0.9519	0.9832
F-test	1299.75***	1712.08***	2467.80***	5538.44***
Hausman-test	14.44**	26.66***	17.34***	20.04***
Obs	155	155	155	155

Note: t-values are reported in parentheses.

* p < 0.1;

** p < 0.05;

*** p < 0.01.