Tiantian Zhang1, Weili Lin 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

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

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Cite this article:

Zhang, T., Lin, W., Ran, L., Ma, Z., Yao, Q., Liu, J., Ming, J. (2020) Two-height Distribution of Ozone and Nitrogen Oxides during Summer in Urban Tianjin, China: An Observational Study. Aerosol Air Qual. Res., 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.


An air flow drainage system was established at a high altitude on a 255-m meteorological tower in urban Tianjin. Measurements of the gaseous pollutants, including ozone (O3) and nitrogen oxides (NOx), could therefore be simultaneously performed at a height of 220 m and 3 m above the ground in summer 2018. Observational results showed similar diurnal variations in O3 concentrations near the surface and at 220 m, but an apparent distinction between O3 concentrations at different heights was observed. A higher level of O3 was observed near the surface than at 220 m during the day, but the opposite was observed at night. Concentrations of NO and NO2 were generally higher near the surface than at 220 m. The difference between NO2 concentrations at two altitudes was the lowest in the daytime and highest at night. Ox (O3 + NO2) concentration near the surface was higher than at 220 m during the day, whereas at night, the difference between Ox concentrations at different heights was negligible. Given the higher level of NOx near the surface, photochemical production of O3 (Ox) could have been intensified during the daytime at low altitudes, suggesting that surface O3 concentration was mainly influenced by local photochemical production. According to the measured reactive nitrogen (NOy) near the surface, ozone production efficiency (OPE, Ox/NOz) was calculated from NOz (NOy − NOx) as 6.0 ± 0.4 in urban Tianjin for the first time. Compared with the measurements in summer 2010, NOx concentration in summer 2018 had declined, whereas O3 concentration had largely increased.

Keywords: Nitrogen Oxides; Ozone; Vertical Observation; Ozone Production Efficiency

Impact Factor: 2.735

5-Year Impact Factor: 2.827

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