Null hypothesis

Fog-haze risk comprehensive index equation

Industrial structure equation

Energy use efficiency equation

$H_{01}:{\theta }_3=0$

10.71**

(0.57)

2.18**

(0.05)

5.88**

(0.07)

$H_{02}:{\theta }_2=0|{\theta }_3=0$

11.68*

(0.52)

1.16**

(0.02)

3.61**

(0.01)

$H_{03}:{\theta }_1=0|{\theta }_2={\theta }_3=0$

1.65**

(0.04)

0.36**

(0.29)

0.97**

(0.00)