The population in Tehran is on the rise, and the majority of the cars rolling off the assembly lines or brought into the country are earmarked for the metropolis. The old and decrepit models are never discarded and contribute to the traffic jam and pollution. As long as there is traffic, there will be pollution. The car can be tamed with strict controls on circulation and elimination of faulty and inefficient machines. As always, cash shortage and lack of a budget is an added obstacle.
Pollution control needs funds.
These vehicles have outlived their effective life span. The high cost of parts and repairs is another deterrent for low income rivers. Some 20 percent of the passenger load in the city is carried by private and public taxis. An increasing cross section of the urban population is hauling passengers to compliment their meager incomes. Young and old cruise around the streets in order to make a little extra income to feed the family.