Research article

A 50-year record of NO_xand SO₂sources in precipitation in the Northern Rocky Mountains, USA

David L Naftz¹^*, Paul F Schuster² and Craig A Johnson³

¹ U.S. Geological Survey, 2329 W. Orton Circle, Salt Lake City, UT 84119, USA

² U.S. Geological Survey, 3215 Marine Street, Suite E-127, Boulder, CO 80303, USA

³ U.S. Geological Survey, Denver Federal Center, MS 963, Denver, CO 80225, USA

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Geochemical Transactions 2011, 12:4 doi:10.1186/1467-4866-12-4

Published: 7 March 2011

Additional file 1:

Supporting data. Isotopic and anion data used in the study

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A 50-year record of NOx and SO2 sources in precipitation in the Northern Rocky Mountains, USA