Table
| Sulphur dioxide (SO2) | Nitrogen oxides (NOX) | Ammonia (NH3) | Non-methane volatile organic compounds (NMVOC) | Carbon monoxide (CO) | |
|---|---|---|---|---|---|
| 1Does not include ocean transport and international air transport. | |||||
| 1990 | 52.3 | 199.9 | 23.7 | 301.7 | 825.8 |
| 2000 | 27.2 | 211.6 | 25.3 | 390.9 | 626.7 |
| 2011 | 18.8 | 185.7 | 26.0 | 144.9 | 436.0 |
| 2012 | 17.3 | 179.8 | 26.4 | 144.4 | 429.0 |
| 2013 | 16.8 | 168.8 | 26.4 | 148.7 | 399.1 |
| 2014 | 16.5 | 159.0 | 26.6 | 158.7 | 379.2 |
| 2015 | 16.4 | 153.2 | 26.7 | 157.0 | 384.9 |