Car emissions draining Nairobi economy

Standard Digital News: "In Nairobi, for instance, vehicular emissions are estimated to contribute close to 40 per cent of urban air pollution. The economic loss arising from vehicle emission-related illnesses and deaths is estimated at Sh115 billion per year (University of Nairobi, 2012). The figure could be higher. With the knowledge that deaths resulting from such pollutions can be prevented, the big question remains how?"