Yimin Huang1, Liuyi Zhang1,2, Yang Qiu3, Yang Chen2, Guangming Shi This email address is being protected from spambots. You need JavaScript enabled to view it.3, Tingzhen Li1, Lei Zhang1, Fumo Yang This email address is being protected from spambots. You need JavaScript enabled to view it.1,2,3

Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir, Chongqing Three Gorges University, Chongqing 404100, China
Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
National Engineering Research Center for Flue Gas Desulfurization, Department of Environmental Science and Engineering, Sichuan University, Chengdu 610065, China


Received: January 2, 2020
Revised: April 25, 2020
Accepted: April 25, 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.2019.10.0516 

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Cite this article:

Huang, Y., Zhang, L., Qiu, Y., Chen, Y., Shi, G., Li, T., Zhang, L. and Yang, F. (2020). Five-year Record of Black Carbon Concentrations in Urban Wanzhou, Sichuan Basin, China. Aerosol Air Qual. Res. 20: 1282–1293. https://doi.org/10.4209/aaqr.2019.10.0516


  • Temporal distribution of BC showed a distinct declining trend.
  • BC contamination in Wanzhou is still serious when compared to other urban areas.
  • The morning peak of BC concentration appeared later in winter than in other seasons.
  • BC concentration in Wanzhou is affected by traffic, industry and biomass combustion.


The atmospheric fine particle black carbon (BC) was measured from June 2013 till February 2018 in Wanzhou District, the second largest metropolitan area in Chongqing Municipality, China, which is located in the eastern Sichuan Basin. The average daily concentration ranged from 0.5 to 10.4 µg m–3, with a mean of 4.4 ± 2.2 µg m3, and the annual mean displayed a significantly decreasing trend, from 5.3 µg m3 in 2013 to 3.7 µg m3 in 2017. The frequency distribution of the average daily concentrations during the years 2014–2017 skewed toward lower values (compared to the rest of the study period), with over 60% falling between 1 and 5 µg m3. The BC exhibited a seasonal pattern, with the highest concentrations being reported during winter, followed by spring and fall, and the lowest ones during summer, as well as a double-peaked diel variability all year round, with a morning peak occurring between 07:00 and 09:00 and an evening peak between 19:00 and 21:00. Furthermore, the concentration was negatively correlated with the planetary boundary layer (PBL) height and influenced by the strong scavenging effect of precipitation. An inverse relationship between the concentration and the wind speed was observed when the latter was below 2.0 m s–1. The wind direction also affected the concentration, with easterly and southeasterly winds accompanying higher levels of BC regardless of the season.

Keywords: Black carbon; Seasonal variation; Diel variation; Meteorological parameters.

Aerosol Air Qual. Res. 20:1282-1293. https://doi.org/10.4209/aaqr.2019.10.0516 

Impact Factor: 2.735

5-Year Impact Factor: 2.827

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