The impact of air pollution on human heath represents a serious public health crisis across Asia and the Pacific. Fewer than 8 per cent of the region’s people are exposed to levels of air pollution that do not pose a significant risk to their health according to the World Health Organization (WHO) Guideline. There is now sufficient evidence from epidemiological studies in Asia and the Pacific that exposures to PM2.5 and ground-level ozone are the most health damaging and account for large attributable health burdens. Air Pollution in Asia and the Pacific: Science-based Solutions identifies 25 clean air measures that can positively impact human health, crop yields, climate change and socio-economic development, as well as contribute to achieving the Sustainable Development Goals. Implementing these measures could help 1 billion people breathe cleaner air by 2030 and reduce global warming by a third of a degree Celsius by 2050.