The ban on importing diesel cars to Lebanon seems to have been introduced in the 60s or 70s to stop their own citizens informally importing large numbers of used Mercedes diesel limousines for use as long distance taxis (a common form of public transport in the Middle East). No doubt, the ban had economic grounds, possibly because the Lebanese Government was losing some form of sales tax income. However, there is now an environmental dimension, as diesel fuel is generally seen as being more polluting than petrol, though this is disputed by some parties.