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South Asia is home to 9 of the world's 10 cities with the worst air pollution. Concentrations of fine particulate matter (PM2.5) in some of the region's most densely populated and poor areas are up to 20 times higher than what the World Health Organization considers healthy (5 micrograms per cubic meter). This pollution causes an estimated 2 million premature deaths in the region each year and results in significant economic costs. Controlling air pollution is difficult without a better understanding of the activities that cause emissions of particulate matter. Air pollution travels long distances in South Asia and gets trapped in large 'airsheds' that are shaped by climatology and geography. This publication identifies six major airsheds in the region and analyzes four scenarios for reducing air pollution with varying degrees of policy implementation and cooperation among countries. The analysis shows that cooperation between different jurisdictions within an airshed is crucial, and a schematic road map with three phases is proposed. The phases in the road map may overlap when the rate of progress differs, depending on local circumstances. Phase 1 would improve monitoring and institutions; Phase 2 would introduce additional and joint targets for cost-effective abatement; and Phase 3 would mainstream air quality in the economy.

Air --- Air quality. --- Pollution --- Health aspects. --- World Health Organization.