| Year | PM2.5 (μg/m3) | ||||
| Mean | Standard deviation (SD) | Minimum | Maximum | Median | |
| 2012 | 25.47 | 17.39 | 0 | 132 | 22 |
| 2013 | 30.70 | 20.25 | 0 | 179 | 27 |
| 2014 | 27.75 | 20.54 | 1 | 145 | 24 |
| 2015 | 24.44 | 19.83 | 0 | 145 | 20 |
| 2016 | 25.36 | 16.73 | 3 | 153 | 21 |