Table 4.
Variables and description.
| Variable Type | Notation | Meaning | Unit | Description |
|---|---|---|---|---|
| Explained Variable | Iwg | Industrial waste gas | Million cu. m | Selecting the three industrial wastes as environmental control indicators [34]. |
| Iww | Industrial waste water | 10,000 tons | ||
| Isw | Industrial solid waste | 10,000 tons | ||
| Explanatory variable | Gwg | Investment in industrial waste gas treatment | 10,000 yuan/million cu.m | Government supervision |
| Gww | Investment in industrial waste water treatment | 10,000 yuan/Ten thousand tons | ||
| Gsw | Investment in industrial solid waste treatment | 10,000 yuan/ 10,000 tons | ||
| Pwg | Number of public participation in industrial waste gas problem | 10,000 times | Public participation in environmental governance through letters and visits, phone calls, and Internet | |
| Pww | Number of public participation in industrial waste water problem | 10,000 times | ||
| Psw | Number of public participation in industrial solid waste problem | 10,000 times | ||
| Control variable | Psg | The proportion of secondary industry to GDP | % | Regional industrial layout is closely related to environmental quality. The larger the proportion of secondary industry, the worse the environmental quality [35]. |
| Neu | Number of enterprises per unit area | Number/square kilometer | The greater the density of enterprises, the more serious the environmental problem [36]. | |
| Dpe | degree of public education (Average Years of Education) |
Year | The more educated the public is, the more attention they will pay to environmental issues, which in turn will improve environmental conditions [37]. |