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In page Classic car:
"Classic cars are typically build to meet the national car emission levels that were present in the year of production of the vehicle. EU and US emission standards have increased in many countries since then. As a result, they may not be allowed to enter cities with special emission restrictions or low emission zones[1][2][3][4]. Converting the car to run on a different fuel (i.e. SVO, LPG, CNG, hydrogen, ...) may decrease emission levels.[5][6][7]
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