Congratulations to Professor Ann Marie Carlton, Professor and Vice Chair of the UC Irvine Department of Chemistry, for her new election to the American Association for the Advancement of Science (AAAS) as a 2025 Fellow, for her groundbreaking research showing how water in the atmosphere affects the chemistry of air pollution. Her discoveries have changed how scientists and policymakers think about air quality and have influenced regulations in the U.S. and around the world.