Air pollution is the fifth largest killer and seventh biggest illness burden in India as estimated by the Global Burden of Disease (GBD) report. The speed at which urban air pollution is growing across our cities is alarming. Severe particulate pollution and newer pollutants like nitrogen oxides, ozone and air toxics are worsening the public health challenge. Vehicles are a special challenge as these are the fastest growing sources of air pollution. Vehicles emit close to our breathing zone and contribute significantly to human exposure.