Flight, One-way, Stockholm-Helsinki (ARN-HEL)

Air travel is the mode of travel with the highest emissions. The emission factor for air travel shows how much emissions are caused by flights. The emission factor can be expressed for each trip (kg/trip) or based on the emissions per kilometer or passenger-kilometer (pkm) in g/km. The emission factor for a short flight is higher than for a long-distance flight because the aircraft consumes more fuel during take-off and landing than after reaching the full altitude. The emission factor may also take into account the so-called radiative forcing (RF). However, a long flight does produce more emissions than a short flight.