“Fingerprinting” Vehicle Derived Ammonia Utilizing Nitrogen Stable Isotopes

Wendell Walters1, Meredith Galanter Hastings2 and Nadia Kathryn Colombi1,3, (1)Brown University, Institute at Brown for Environment and Society, Providence, RI, United States, (2)Brown Univ-Geological Sciences, Providence, RI, United States, (3)University of California Los Angeles, Institute of the Environment and Sustainability, Los Angeles, CA, United States