| 8 h O3 | 8 h maximum ozone |
| CO | carbon monoxide |
| IQR | interquartile range |
| NO2 | nitrogen dioxide |
| PM2.5 | particulate matter ≤ 2.5 μm in aerodynamic diameter |
| PM10 | particulate matter ≤ 10 μm in aerodynamic diameter |
| Q1 | 1st percentile |
| Q2 | 2nd quartile |
| Q3 | 3rd quartile |
| Q4 | 4th quartile |
| Q99 | 99th percentile |
| SD | standard deviation |
| SO2 | sulfur dioxide |
| UEBMI | urban employee-based basic medical insurance scheme |
| URBMI | urban resident-based basic medical insurance scheme |
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