Articles | Volume 16, issue 10
https://doi.org/10.5194/acp-16-6355-2016
https://doi.org/10.5194/acp-16-6355-2016
Research article
 | 
24 May 2016
Research article |  | 24 May 2016

Formation of reactive nitrogen oxides from urban grime photochemistry

Alyson M. Baergen and D. James Donaldson

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Subject: Gases | Research Activity: Laboratory Studies | Altitude Range: Troposphere | Science Focus: Chemistry (chemical composition and reactions)
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Cited articles

Ammar, R., Monge, M. E., George, C., and D'Anna, B.: Photoenhanced NO2 Loss on Simulated Urban Grime, Chem. Phys. Chem., 11, 3956–3961, https://doi.org/10.1002/cphc.201000540, 2010.
Baergen, A. M. and Donaldson, D. J.: Photochemical renoxification of nitric acid on real urban grime, Environ. Sci. Technol., 47, 815–820, https://doi.org/10.1021/es3037862, 2013.
Baergen, A. M., Styler, S. A., van Pinxteren, D., Muller, K., Herrmann, H., and Donaldson, D. J.: Chemistry of Urban Grime: Inorganic Ion Composition of Grime vs Particles in Leipzig, Germany, Environ. Sci. Technol., 49, 12688–12696, https://doi.org/10.1021/acs.est.5b03054, 2015.
Bodhaine, B. A., Wood, N. B., Dutton, E. G., and Slusser, J. R.: On Rayleigh Optical Depth Calculations, J. Atmos. Ocean. Tech., 16, 1854–1861, https://doi.org/10.1175/1520-0426(1999)016<1854:ORODC>2.0.CO;2, 2010.
Chabas, A., Lombardo, T., Cachier, H., Pertuisot, M. H., Oikonomou, K., Falcone, R., Verità, M., and Geotti-Bianchini, F.: Behaviour of self-cleaning glass in urban atmosphere, Build. Environ., 43, 2124–2131, https://doi.org/10.1016/j.buildenv.2007.12.008, 2008.
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Short summary
"Urban grime" films form from the deposition of atmospheric constituents on urban surfaces exposed to the atmosphere. An important component is nitrate, which is thought to represent a final loss channel of nitrogen oxides from the atmosphere. In this study we show that nitrate photolysis on grime is a significant loss process and gives rise to gas phase nitrogen oxides, effectively recycling them to the atmosphere and thus impacting local ozone levels.
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