Table
| 2011 | Change in per cent | ||
|---|---|---|---|
| 1990 - 2011 | 2010 - 2011 | ||
| Nitrogen oxides (NOX) | 180 | -8.0 | -3.8 |
| Sulphur dioxide (SO2) | 19 | -63.9 | -3.4 |
| Ammonia (NH3) | 26 | 8.3 | -1.9 |
| Non-methane volatile organic compounds (NMVOC) | 139 | -52.6 | -2.7 |
| Carbon monoxide (CO) | 311 | -58.3 | -8.0 |
| 2011 | Change in per cent | ||
|---|---|---|---|
| 1990 - 2011 | 2010 - 2011 | ||
| Nitrogen oxides (NOX) | 180 | -8.0 | -3.8 |
| Sulphur dioxide (SO2) | 19 | -63.9 | -3.4 |
| Ammonia (NH3) | 26 | 8.3 | -1.9 |
| Non-methane volatile organic compounds (NMVOC) | 139 | -52.6 | -2.7 |
| Carbon monoxide (CO) | 311 | -58.3 | -8.0 |