First detection of nitrogen from NOx in tree rings: a 15N/14N study near a motorway

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Saurer, M., Cherubini, P., Ammann, M., De Cinti, B., & Siegwolf, R. (2004). First detection of nitrogen from NOx in tree rings: a 15N/14N study near a motorway. Atmospheric Environment, 38, 2779-2787. https://doi.org/10.1016/j.atmosenv.2004.02.037