A transportation vehicle navigation method with a navigation system of a transportation vehicle for determining at least one route and navigation based on the determined route according to a position of the transportation vehicle. The method includes detecting at least one environmental characteristic of the transportation vehicle, specific for at least one emission of the transportation vehicle, by at least one sensor of the transportation vehicle to determine a detection result; performing an evaluation of the detection result to determine an evaluation result; and adapting the determined route during the navigation based on the evaluation result.