This week we were fortunate to have our Clean Air Toolbox partners Dr. Godwin Opinde and Tedy Mwendwa from Kenyatta University, Nairobi, Kenya and Dr. Ajay Nagpure, formerly of WRI India, currently at the Urban Nexus Lab at Princeton University, join us to present on their work and engage in a lively discussion with each other and Columbia based members of the Clean Air Toolbox team. Dr. Opinde and Mr. Mwendwa's visit was sponsored by a U.S. Department of State-funded project for air quality management capacity building in East Africa led by Prof. Dan Westervelt. We were also joined by Andrea Belvis-Aquino, a student from University of Puerto Rico-Mayaguez who is visiting the Westervelt group. The visit concluded with a tour of the McNeill Lab.