| UN R49 Diesel and CNG/LNG Engine Emissions | UN Regulation | UNR 0049 |
| UN R67 Liquefied Petroleum Gas Equipment | UN Regulation | UNR 0067 |
| UN R110 Compressed and Liquefied Natural Gas System Components | UN Regulation | UNR 0110 |
| UN R115 Liquefied Petroleum and Compressed Natural Gas Retrofit Systems | UN Regulation | UNR 0115 |
| UN R132 Retrofit Emission Control Devices | UN Regulation | UNR 0132 |
| UN R143 Heavy-Duty Dual Fuel Retrofit Systems | UN Regulation | UNR 0143 |