Tiantian Zhang1, Weili Lin This email address is being protected from spambots. You need JavaScript enabled to view it.1, Liang Ran2, Zhiqiang Ma3, Qing Yao4, Jingle Liu4, Jing Ming5

College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
Beijing-Tianjin-Hebei Prediction and Early Warning Center for Environmental Meteorology, Beijing 100089, China
Tianjin Institute of Meteorological Science, Tianjin 300074, China
Beacon Science & Consulting, Doncaster East, VIC 3109, Australia


Received: October 10, 2019
Revised: March 27, 2020
Accepted: April 8, 2020

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.4209/aaqr.2019.10.0505

Cite this article:

Zhang, T., Lin, W., Ran, L., Ma, Z., Yao, Q., Liu, J. and Ming, J. (2020). Dual-height Distribution of Ozone and Nitrogen Oxides during Summer in Urban Tianjin: An Observational Study. Aerosol Air Qual. Res. 20: 2159–2169. https://doi.org/10.4209/aaqr.2019.10.0505


  • An air flow drainage system at 220 m high were set up in urban Tianjin.
  • Vertical O3 and NOx in summer has been measured on line just at ground.
  • Ozone Production Efficiency was firstly reported in urban Tianjin.
  • Local photochemical production prevails in summer in urban Tianjin.


Measurements of gaseous pollutants, including ozone (O3) and nitrogen oxides (NOx), were simultaneously conducted at 220 m (via the installation of an air flow drainage system on a 255-m meteorological tower) and 3 m above the ground in urban Tianjin during summer 2018. The observed O3 concentrations at the two altitudes exhibited similar diurnal variations but distinctly different values, with higher levels near the surface during the day and the opposite trend at night. Generally higher concentrations of NO and NO2 were found at 3 m than 220 m, and the difference in concentration between the two altitudes for the latter pollutant was smaller during daytime and highest at night. Ox (O3 + NO2) concentration near the surface during the day, but the difference was negligible at night. Based on the higher NOx level at 3 m, the photochemical production of O3 (Ox) at low altitudes intensified during the day, suggesting that the O3 surface concentration was mainly influenced by local photochemical production. Additionally, by measuring the reactive nitrogen (NOy) near the surface and calculating NOz (NOy – NOx), the ozone production efficiency (OPE; Ox/NOz) in urban Tianjin was assessed for the first time and determined to be 6.0 ± 0.4. Compared to the values measured during summer 2010, lower levels of NOx but significantly higher ones for O3 were observed during the same season in 2018.

Keywords: Nitrogen oxides; Ozone; Vertical observation; Ozone production efficiency.

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