Nitrous acid can initiate photochemical air pollution events, but it is not clear where it comes from. Laboratory experiments now suggest that surface-bound nitrite accumulated overnight can release nitrous acid during the daytime.
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Raff, J. Night-time sinks, daytime sources. Nature Geosci 8, 5–7 (2015). https://doi.org/10.1038/ngeo2315
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DOI: https://doi.org/10.1038/ngeo2315
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