EU Euro emissions standards. Adapted from Lethal and Illegal, Solving London’s Air Pollution Crisis by Institute for Public Policy Research, September 2016, and SMMT Euro Standards for Cars (accessed March 2018)
| Euro emissions standards | Petrol cars | Diesel cars | ||
| NOX (g/km) | PM10 (g/km) | NOX (g/km) | PM10 (g/km) | |
| Euro 4 (2005) | 0.08 | – | 0.25 | 0.025 |
| Euro 5 (2009) | 0.06 | 0.005 | 0.18 | 0.005 |
| Euro 6 (2014) | 0.06 | 0.005 | 0.08 | 0.0045 |