The World Bank together with the United States Environmental Protection Agency and the United States Department of State, are jointly sponsoring a session at the UN Global Science, Policy, and Business Forum on the Environment that will highlight a new draft white paper on the role of low cost sensors, satellite based measurements, ground-level measurements and data management strategies in generating reliable and actionable estimates of ambient air quality in developing countries. The draft white paper is an outcome of the Filling the Gaps Workshop held in July 2017 in Washington, DC. At this time, the authors are seeking input on this draft. If you would like to provide comments, please send them to the team.