Emmie Le Roy

Emmie Le Roy is a PhD candidate in atmospheric chemistry in the Department of Earth, Atmospheric & Planetary Sciences at MIT. In 2024-2025 she is a member of the MIT Martin Family Society of Fellows for Sustainability. Her research focuses on the interactions between climate variability and atmospheric composition using a combination of models and in-situ observations. Her work addresses uncertainty in future projections of climate and air quality. Recent work has focused on understanding how surface ozone, an important component of smog, will respond to changes in precursor emissions in a future climate. This has implications for assessing whether emission control policies designed under a present-day climate will remain effective under a future climate. Her work leverages recent advances in high-performance computing to run chemical transport models using meteorological inputs from “ensembles” of climate model projections. Her doctoral advisor is Professor Noelle Selin. 

Emmie received her ScB in Geology and Chemistry from Brown University in 2019. Her honors thesis investigated the sources of ammonium pollution in rainwater using stable isotope analysis. While at Brown, she also taught environmental science lessons to high school students in Providence, Rhode Island. Before starting her PhD, she worked as a laboratory assistant for the Surface PARTiculate mAtter Network (SPARTAN), a global ground-based measurement network for PM2.5. She has been involved in organizing the student-run Graduate Climate Conference as well as running peer mentoring activities at her university department.