| ANSP | Air Navigation Service Provider |
| ASK | Available Seat Kilometre |
| ATM | Air Traffic Management |
| CAEP | Committee on Aviation Environmental Protection |
| CEM | Collaborative Environmental Management |
CO / CO2 |
Carbon monoxide / Carbon dioxide |
CO2eq |
Carbon Dioxide equivalent |
| CORSIA | Carbon Offsetting and Reduction Scheme for International Aviation |
| dB | decibel |
| EASA | European Union Aviation Safety Agency |
| EC | European Commission |
| EEA | European Environment Agency |
| EFTA | European Free Trade Association |
| EPNdB | Effective Perceived Noise decibel |
| ETS | Emissions Trading System |
| EU | European Union |
| EU27 | 27 Member States of the European Union |
| ft | Feet |
| GHG | Greenhouse gas |
| GWP | Global Warming Potential |
| ICAO | International Civil Aviation Organization |
| IPCC | Intergovernmental Panel on Climate Change |
| kg | Kilogram |
| km | Kilometre |
| kN | Kilonewton |
| kt | kilotonnes |
| kW | kiloWatts |
| lbf | Pound (force) |
Lden / Lnight |
Day-evening-night / Night-time sound pressure level |
| LTO | Landing and Take-Off |
| MJ | Megajoule |
| MRV | Monitoring, Reporting and Verification |
| Mt | Megatonne, million metric tonnes |
| MTOM | Maximum Take-Off Mass |
| MW | Megawatts |
| NGO | Non-Governmental Organization |
| NM | Network Manager |
| nmi | nautical miles |
NOX |
Nitrogen Oxides |
O3 |
Ozone |
| pkm | Passenger Kilometre |
| PM | Particulate Matter (nvPM – non-volatile, vPM – volatile) |
| RED | Renewable Energy Directive |
| SES | Single European Sky |
| SESAR | Single European Sky ATM Research |
SOX |
Sulphur Oxides |
| UAV | Unmanned Aerial Vehicle |
| UNFCCC | United Nations Framework Convention on Climate Change |
| WHO | World Health Organization |
