Articles | Volume 21, issue 3
https://doi.org/10.5194/acp-21-1613-2021
https://doi.org/10.5194/acp-21-1613-2021
Research article
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08 Feb 2021
Research article | Highlight paper |  | 08 Feb 2021

Low-NO atmospheric oxidation pathways in a polluted megacity

Mike J. Newland, Daniel J. Bryant, Rachel E. Dunmore, Thomas J. Bannan, W. Joe F. Acton, Ben Langford, James R. Hopkins, Freya A. Squires, William Dixon, William S. Drysdale, Peter D. Ivatt, Mathew J. Evans, Peter M. Edwards, Lisa K. Whalley, Dwayne E. Heard, Eloise J. Slater, Robert Woodward-Massey, Chunxiang Ye, Archit Mehra, Stephen D. Worrall, Asan Bacak, Hugh Coe, Carl J. Percival, C. Nicholas Hewitt, James D. Lee, Tianqu Cui, Jason D. Surratt, Xinming Wang, Alastair C. Lewis, Andrew R. Rickard, and Jacqueline F. Hamilton

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Cited articles

Acton, J., Hewitt, N., Huang, Z., and Wang, X.: APHH: Volatile organic compound (VOC) mixing ratios made at the IAP-Beijing site during the summer and winter campaigns, Centre for Environmental Data Analysis, available at: https://catalogue.ceda.ac.uk/uuid/de37c54e59a548ccb9f168ee724f3769 (last access: 19 January 2021), 2018. 
Acton, J., Hewitt, N., Huang, Z., and Wang, X.: APHH: Volatile organic compound (VOC) flux measurements made during the APHH-Beijing field campaigns 11-12/2016 and 05-06/2017, Centre for Environmental Data Analysis, available at: https://catalogue.ceda.ac.uk/uuid/9e11d5cb819a45068921db5ae296fb57 (last access: 19 January 2021), 2020. 
Air Quality Expert Group: Ozone in the United Kingdom, Department for the Environment, Food and Rural Affairs, UK, available at: https://uk-air.defra.gov.uk/assets/documents/reports/aqeg/aqeg-ozone-report.pdf (last access: 15 January 2021), 2009. 
Bianchi F., Kurtén, T., Riva, M., Mohr, C., Rissanen, M. P., Roldin, P., Berndt, T., Crounse, J. D., Wennberg, P. O., Mentel, T. F., Wildt, J., Junninen, H., Jokinen, T., Kulmala, M., Worsnop, D. R., Thornton, J. A., Donahue, N., Kjaergaard, H. G., and Ehn, M.: Highly Oxygenated Organic Molecules (HOM) from Gas-Phase Autoxidation Involving Peroxy Radicals: A Key Contributor to Atmospheric Aerosol, Chem. Rev., 119, 3472–3509, 2019. 
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Short summary
We report the formation of secondary pollutants in the urban megacity of Beijing that are typically associated with remote regions such as rainforests. This is caused by extremely low levels of nitric oxide (NO), typically expected to be high in urban areas, observed in the afternoon. This work has significant implications for how we understand atmospheric chemistry in the urban environment and thus for how to implement effective policies to improve urban air quality.
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