Rashid Shaikh is a scientist who lives in Cambridge. In 2000, he retired from working as the director for science at the Health Effects Institute. Previously, he worked as the director for science at the Health Effects Institute, an independent non-profit organization, jointly funded by the EPA and the auto manufacturers, which has provided some of the most critical science to inform air pollution policies in the US and abroad. His presentation, titled “Air Pollution and Climate Change: A Tale of Twin Challenges,” focuses on the effects and magnitude of air pollution on human health, the impact of regulations, and the disproportionate burden on EJ and underserved communities from mobile sources. He also discusses the (major) contribution of the transportation sector to GHG emissions and the co- benefits of policies to address climate change.