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Buhr, Martin P, inventor; Air Quality Design, Inc., assignee. Solid-state light source photolytic nitrogen dioxide converter. United States patent US 7,238,328 B2. 2007 July 3

http://www.google.com/patents/about?id=uXOAAAAAEBAJ

Sather, M. E., E. T. Slonecker, K. G. Kronmiller, D. Williams, H. Daughtrey, J. Mathew, Evaluation of short-term Ogawa passive, photolytic, and federal reference method sampling devices for nitrogen oxides in El Paso and Houston, Texas, J. Environ. Monit., 2006, 8, 558-563.

http://pubs.rsc.org/en/content/articlelanding/2006/em/b601113f

Reidmiller, D. R., D. A. Jaffe, E.V. Fischer, B. Finley, Nitrogen oxides in the boundary layer and free troposphere at the Mt. Bachelor Observatory, Atmos. Chem. Phys., 10, 6043-6062, 2010

www.atmos-chem-phys.net/10/6043/2010/

Lee, J. D., S. J. Moller, K. A. Read, A. C. Lewis, L. Mendes,  L. J. Carpenter, J, Year-round measurements of nitrogen oxides and ozone in the tropical North Atlantic marine boundary layer, J. Geophys. Res., 114, D21302, 2009

http://www.agu.org/pubs/crossref/2009/2009JD011878.shtml

Read, K. A., A. S. Mahajan, L. J. Carpenter, M. J. Evans, B. V. E. Faria, D. E. Heard, J. R. Hopkins, J. D. Lee, S. J. Moller, A. C. Lewis, L. Mendes, J. B. McQuaid, H. Oetjen, A. Saiz-Lopez, M. J. Pilling, J. M. C. Plane, Extensive halogen-mediated ozone destruction over the tropical Atlantic Ocean, Nature, 453, 1232-1235. 2008

http://www.nature.com/nature/journal/v453/n7199/abs/nature07035.html