Table
| 2015 | Change in per cent | ||
|---|---|---|---|
| Since 1990 | 2014 - 2015 | ||
| 1Does not include international sea and air traffic. | |||
| Nitrogen oxides (NOX) | 153 | -23.4 | -3.7 |
| Sulphur dioxide (SO2) | 16 | -68.7 | -0.9 |
| Ammonia (NH3) | 27 | 12.3 | 0.5 |
| Non-methane volatile organic compounds (NMVOC) | 157 | -48.0 | -1.0 |
| Carbon monoxide (CO) | 385 | -53.4 | 1.5 |