| PTB | pulmonary tuberculosis |
| NO2 | nitrogen dioxide |
| PM | particulate matter |
| O3 | ozone |
| WIN | wind speed |
| TEM | temperature |
| RHU | relative humidity |
| SSD | sunshine duration |
| PGDP | per capita gross domestic product |
| PD | population density |
| MTP | numbers of medical technical personnel |
| IQR | Inter-Quartile Range |
| SD | Standard Deviation |
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