Traffic congestion, the car moves at low speed Stopping off frequently and make the oil burned more. When the burning of fuels and emissions are pollutants in the exhaust, increasing the proportion of.
The car traffic is moving at low speed. There are frequent stops and the oil burned more. When incomplete combustion of fuel and exhaust pollution emissions in proportion to the increase.
A traffic jam makes the car moves with speed is low. A stop and start, often making oil burn more and more. When the burning of fuel is not complete and releasing pollution exhaust in proportion to more.