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Characteristics of air pollutant concentration (1988–2016)
| SPM mg·m−3 | NO ppb | NO2 ppb | Smoking rate % | |
| Median | 0.033 | 0.023 | 0.026 | 30.9 |
| Min | 0.020 | 0.007 | 0.015 | 19.3 |
| Max | 0.043 | 0.037 | 0.030 | 36.9 |
SPM: suspended particulate matter; NO: nitrogen monoxide; NO2: nitrogen dioxide.
