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 | 192.1 | 24.3 | 291.1 | 747.2 |
| 2000 | 27.2 | 204.4 | 26.1 | 379.7 | 517.8 |
| 2010 | 19.7 | 179.3 | 27.4 | 140.6 | 333.5 |
| 2011 | 18.8 | 172.3 | 26.9 | 134.2 | 305.5 |
| 2012 | 17.3 | 165.2 | 27.2 | 135.8 | 297.0 |
| 2013 | 17.1 | 156.3 | 27.2 | 134.8 | 261.8 |
| 2014 | 16.7 | 147.8 | 26.8 | 139.7 | 247.1 |