How Technological Innovation Influences Environmental Pollution: Evidence from China

Table 3

Results of unit root test.

Variable	LLC-test	IPS-test	ADF-test	PP-test	Result
Wastewater	−14.9361	−7.25428	−5.32203	−5.21888	Smooth
Δwastewater	−18.4038	−10.9611	−9.05958	−11.1499	Smooth
Solid waste	−0.49884	4.37137	4.10015	5.35996	Not smooth
Δsolid waste	−13.304	−6.18938	−6.37182	−8.14711	Smooth
Exhaust gas	−13.246	−8.20254	−6.71452	−9.14431	Smooth
Δexhaust gas	−12.472	−8.0203	−7.2352	−11.1865	Smooth
TECINN	−4.8807	0.92277	56.1363	54.2141	Not smooth
ΔTECINN	−17.4002	−9.52198	186.539	−12.9367	Smooth

Note., , and shows significance at the 1% level, 5% level, and 10% level, respectively.△ represents the 1st order difference.