As a vehicle is refuelled, these vapours are pushed out of the tank by the incoming fuel and, unless captured, escape into the atmosphere out of the top of the vehicle filler pipe.
Cita, 1994. gada, direktīva jau ļauj ierobežot emisijas, kas rodas, benzīnu uzglabājot un no termināliem nosūtot uz degvielas uzpildes stacijām.