| NO2 | Nitrogen dioxide concentrations |
| PCG | Per capita GDP |
| VN | Traffic development |
| SI | Industrialization |
| GC | Green coverage |
| NG | Nature gas consumption |
| IT | Technology investment |
| RNG | Nature gas consumption of residents |
| EKC | Environmental Kuznets Curve |
| QML | Quasi-maximum likelihood |
| CNEMC | China Environmental Monitoring Center |
| CCSY | China City Statistical Yearbook |
| SCR | Selective Catalytic Reduction |
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