Sally Pusede is an atmospheric chemist with broad interests in air quality, climate, and atmosphere-biosphere interactions. Her research group makes measurements at the Earth’s surface and from onboard aircraft in diverse locations, including polluted cities, agricultural areas, and within forest canopies. Pusede's focus is on the role of reactive nitrogen in chemical oxidation mechanisms and emissions of the greenhouse gas nitrous oxide. She utilizes spatial and temporal variability in her datasets to derive mechanistic insight into processes taking place in urban and human-influenced environments. She and her team work to find solutions to atmospheric problems that adversely affect human health and ecosystems.