Pollutant | 2000 | 2017 | 2018 | 2018 as against 2000 | 2018 as against 2017 |
|---|---|---|---|---|---|
| tonnes | change in percent | ||||
| Ammonia (NH3) | 669,535 | 668,240 | 639,376 | -4.5 | -4.3 |
| Sulphur dioxide (SO2) | 707,427 | 324,046 | 311,942 | -55.9 | -3.7 |
| Nitrogen oxide (NOx) | 2,036,278 | 1,870,944 | 1,827,160 | -10.3 | -2.3 |
| Non-methane volatile organic compounds (NMVOC) | 1,856,625 | 1,193,178 | 1,169,618 | -37.0 | -2.0 |
| Particulate matter 10 micrometre | 330,538 | 259,185 | 251,640 | -23.9 | -2.9 |
| Particulate matter 2.5 micrometre | 192,922 | 147,121 | 134,995 | -30.0 | -8.2 |
| Carbon monoxide (CO) | 5,383,850 | 3,247,394 | 3,145,633 | -41.6 | -3.1 |
As at 30 September 2020