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 | 26.8 | 302.6 | 820.6 |
| 2000 | 27.2 | 211.6 | 28.4 | 390.9 | 623.1 |
| 2012 | 17.4 | 181.8 | 28.4 | 145.2 | 427.7 |
| 2013 | 16.8 | 171.2 | 28.3 | 148.5 | 397.9 |
| 2014 | 16.5 | 161.6 | 28.6 | 158.5 | 378.0 |
| 2015 | 16.4 | 156.2 | 28.4 | 158.8 | 384.5 |
| 2016 | 15.6 | 153.2 | 28.3 | 154.1 | 382.0 |