A passenger-kilometre (pkm) is a unit of measurement used to describe the passenger capacity of a vehicle, such as a taxi or a bus. Passenger-kilometres are calculated by multiplying the distance travelled by the number of passengers carried. For example, a distance of 100 kilometres travelled by three people amounts to 300 passenger-kilometres.
Air traffic emissions can be calculated by passenger kilometre or as distance travelled between airports. Please be careful not to enter the same journey in both sections.
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