Basically, there are two major sources of air pollution in Bangladesh industrial emissions and vehicular emissions.With increased rate of urbanization in the country, the number of vehicles is also increasing rapidly, and contributing to more and more air pollution. At present, there are about 65,000 baby-taxies among them more than 296,000 motor vehicles ply in Dhaka City alone.Moreover, overloaded, poorly maintained and very old trucks and mini-buses are also plying the city streets emitting smokes and gases. In fact about 90% of the vehicles that ply Dhaka's streets daily are faulty, and emit smoke far exceeding the prescribed limit. Diesel vehicles emit black smoke, which contain unburned fine carbon particles.
