Table
| 2016 | Change in per cent | ||
|---|---|---|---|
| Since 1990 | 2015 - 2016 | ||
| 1Does not include international sea and air traffic. | |||
| Nitrogen oxides (NOX) | 153 | -23.4 | -1.9 |
| Sulphur dioxide (SO2) | 16 | -70.1 | -4.5 |
| Ammonia (NH3) | 28 | 5.5 | -0.4 |
| Non-methane volatile organic compounds (NMVOC) | 154 | -49.1 | -2.9 |
| Carbon monoxide (CO) | 382 | -53.4 | -0.7 |