Domestic Transportation Major Source of Urban Air Pollution 

The transportation network is the main source of air pollution in Iranian metropolises, because of the lack of electric vehicles, high fuel consumption of nonstandard vehicles and the widespread use of fossil fuels, according to an energy expert and a professor of Tehran’s Sharif University of Technology.
"We have 8-12 million motorcycles in the country that consume gasoline, and electricity has no share in our transportation network,” Hashem Oraee was also quoted as saying by Donyaye Khodro.
“Another important factor is the gas usage of power plants. According to the latest statistics, the power plants’ share of pollution is about 20% and the share of transportation network pollution is about 60%,” he added.
Oraee, who is also the founder and president of Iran Wind Energy Association, noted that 33% of the country's gas are used in power plants and the volume of gas pollution is lower than that caused by diesel and mazut, which replace gas in the winter.