Jakarta’s expanding fleet of motor vehicles is a key target of urgently needed actions to curb the city’s dangerous air pollution. This briefing paper highlights technologies and
policies to reduce direct emissions from new and in-use cars, trucks, and buses in the city. Such policies, coupled with the promotion of mass transit, non-motorized transport, and other smart growth measures aimed at reducing transport demand, can significantly diminish the adverse effects of transportation on local air quality and public health in Jakarta, and spur similar actions across Indonesia.