Road transportation is one of the leading sources of outdoor air pollution in Southern and Western Africa, particularly in cities, where emissions from light- and heavy-duty vehicles, minibuses, buses, and two-and three-wheelers continue to negatively affect public health, making motor vehicles a central area for rapid policy response.

This report highlights a problem currently being experienced by new Euro IV and V heavy-duty trucks and buses: Despite meeting more stringent regulatory standards for exhaust emissions during type approval, many vehicles equipped with selective catalytic reduction (SCR) systems have significantly elevated emissions of nitrogen oxides (NOx) durin

This new working paper by ICCT identifies the most effective technologies for CO2, emissions and safety measures and maps the status of regulatory programs for 2- and 3-wheeler management in Asian countries.