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 | 24.2 | 291.1 | 747.6 |
| 2000 | 27.2 | 204.4 | 26.1 | 379.7 | 519.0 |
| 2011 | 18.8 | 172.3 | 25.9 | 132.8 | 306.2 |
| 2012 | 17.3 | 164.7 | 26.1 | 132.9 | 297.5 |
| 2013 | 16.7 | 153.0 | 26.2 | 135.5 | 264.1 |
| 2014 | 16.7 | 141.8 | 25.7 | 138.8 | 243.6 |
| 2015 | 16.2 | 134.1 | 26.0 | 134.4 | 248.0 |