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ACP | Articles | Volume 20, issue 9
Atmos. Chem. Phys., 20, 5231–5248, 2020
https://doi.org/10.5194/acp-20-5231-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
Atmos. Chem. Phys., 20, 5231–5248, 2020
https://doi.org/10.5194/acp-20-5231-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 05 May 2020

Research article | 05 May 2020

Nitrous acid (HONO) emissions under real-world driving conditions from vehicles in a UK road tunnel

Louisa J. Kramer et al.

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Cited articles

Alicke, B., Platt, U., and Stutz, J.: Impact of nitrous acid photolysis on the total hydroxyl radical budget during the Limitation of Oxidant Production/Pianura Padana Produzione di Ozono study in Milan, J. Geophys. Res.-Atmos., 107, LOP 9-1–LOP 9-17, https://doi.org/10.1029/2000JD000075, 2002. 
Ammann, M., Kalberer, M., Jost, D. T., Tobler, L., Rössler, E., Piguet, D., Gäggeler, H. W., and Baltensperger, U.: Heterogeneous production of nitrous acid on soot in polluted air masses, Nature, 395, 157–160, https://doi.org/10.1038/25965, 1998. 
Arens, F., Gutzwiller, L., Baltensperger, U., Gäggeler, H. W., and Ammann, M.: Heterogeneous Reaction of NO2 Diesel Soot Particles, Environ. Sci. Technol., 35, 2191–2199, https://doi.org/10.1021/es000207s, 2001. 
Aubin, D. G. and Abbatt, J. P. D.: Interaction of NO2 with hydrocarbon soot: Focus on HONO yield, surface modification, and mechanism, J. Phys. Chem. A, 111, 6263–6273, https://doi.org/10.1021/jp068884h, 2007. 
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HONO is a large source of OH radicals, which can drive VOC oxidation, leading to the formation of ozone and secondary organic aerosols. Here we investigate primary vehicle emissions of HONO from measurements in a road tunnel in Birmingham, UK. A HONO/NOx emission ratio was detemined and compared to previous studies. Results indicate HONO/NOx has not varied much over the last two decades and technologies aimed at reducing NO2 may have also resulted in a reduction in direct HONO vehicle emissions.
HONO is a large source of OH radicals, which can drive VOC oxidation, leading to the formation...
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