| Year | SO2 (mg/m3) | NO2 (mg/m3) | PM10 (mg/m3) |
| 2011 | 0.134 | 0.033 | 0.109 |
| 2012 | 0.137 | 0.039 | 0.107 |
| 2013 | 0.084 | 0.036 | 0.098 |
| 2014 | 0.079 | 0.025 | 0.109 |
| 2015 | 0.077 | 0.022 | 0.097 |
| 2016 | 0.063 | 0.032 | 0.087 |