This episode is the first in the three-part series “Monitoring, Managing, and Markets: Tools for Clean Air.” Over 90% of the global population lives in places where air pollution exceeds safe guidelines—and one in nine deaths worldwide is linked to polluted air. Yet pollution often remains invisible. In this episode, we explore why monitoring is the foundation of effective clean air policy. Evidence from cities such as Beijing, Lahore, Tbilisi, and London shows that when pollution data becomes visible, credible, and usable, people change behavior and governments respond. From embassy monitors to SMS pollution forecasts and household air sensors, the research reveals a powerful insight: information itself can be an intervention. Generated with AI using wondercraft.ai and guided by our experts. Read more at: https://www.pnas.org/doi/10.1073/pnas.2201092119 https://academic.oup.com/ej/advance-article/doi/10.1093/ej/ueaf071/8239786?utm_source=authortollfreelink&utm_campaign=ej&utm_medium=email&guestAccessKey=a9b61781-d56a-4d4d-9c01-4e637fdb13ad&login=false https://documents1.worldbank.org/curated/en/099412307162491936/pdf/IDU-35eca82b-9a89-41f7-8b23-22bedfeef378.pdf https://www.nber.org/system/files/working_papers/w33510/w33510.pdf