Dr. Vivian Pun serves as Technical Head of Breathe Cities for Southeast Asia & Senior Advisor for Air Quality and Health at C40 Cities, a network of the world's megacities committed to addressing climate change. Vivian leads the delivery of the C40-led activities in the Breathe Cities initiative in Southeast Asia, as well as in-house modeling, analysis, report writing, and public communication through C40 air quality technical assistance projects. Vivian is an air pollution epidemiologist with over 15+ years of research experience, focusing on air pollution/environmental health in Hong Kong, USA and Singapore. She holds a PhD degree in Public Health, and Master of Public Health in Epidemiology and Biostatistics.