A major pollution problem in the most of sub-Saharan African Countries  is caused by gasoline being smuggled in. In the case of Benin it is gasoline coming directly from wells in Nigeria and not sufficiently refined. Transport is extremely dangerous because is done  first by trucks, cars, barges and then, for widespread distribution, with motorcycles or carts. Petrol can be found on every street corner at prices about 40% lower than the official ones. Recently the Beninese government is studying a way to reduce illegal sales but there are undoubtedly many problems related to the fact that a large part of the population lives thanks to this parallel market.
In these images the warehouses on the border between Benin and Nigeria, transport and the distribution network.