Table
| 2015 | Change in per cent | ||
|---|---|---|---|
| Since 1990 | 2014 - 2015 | ||
| 1Does not include international sea and air traffic. | |||
| Nitrogen oxides (NOX) | 134 | -30.2 | -5.4 |
| Sulphur dioxide (SO2) | 16 | -69.0 | -2.8 |
| Ammonia (NH3) | 26 | 7.4 | 1.0 |
| Non-methane volatile organic compounds (NMVOC) | 134 | -53.8 | -3.1 |
| Carbon monoxide (CO) | 248 | -66.8 | 1.8 |