Nearly 88 lakh vehicles are registered with the Delhi Transport Department, out of which over 56 lakh are two-wheelers and the rest are cars and others are four-wheelers. According to experts, two-wheelers are the largest contributor to vehicular pollution followed by diesel-run trucks and private cars, in that order.
According to a study by Centre for Science and Environment (CSE), because of their sheer numbers, two-wheelers account for 31 per cent of vehicular pollution in the city whereas cars are responsible for 20 per cent.