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Spatial and Temporal Variability of the PM2.5/PM10 Ratio in Wuhan, Central China

Category: Urban Air Quality

Volume: 17 | Issue: 3 | Pages: 741-751
DOI: 10.4209/aaqr.2016.09.0406
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Gang Xu1,2, Limin Jiao 1,2, Boen Zhang1,2, Suli Zhao1, Man Yuan3, Yanyan Gu4, Jiafeng Liu1,2, Xin Tang1,2

  • 1 School of Resource and Environmental Sciences, Wuhan University, Wuhan 430079, China
  • 2 Key Laboratory of Geographic Information System, Ministry of Education, Wuhan University, Wuhan 430079, China
  • 3 School of Architecture and Urban Planning, Huazhong University of Science and Technology, Wuhan 430074, China
  • 4 State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China

Highlights

The first report on the spatio-temporal variability of PM2.5/PM10 ratio.
Provide insights into the changes of PM2.5/PM10 ratio at diverse scales in Wuhan.
The variability of PM2.5/PM10 ratio should be noticed in its applications.


Abstract

Fine particles (PM2.5) and coarse particles (PM2.5–10) are generally produced by different sources, so the PM2.5/PM10 ratio reveals characteristics of particle pollution. The ratio can be used to characterize the underlying atmospheric processes and evaluate historical PM2.5 pollution in absence of direct measurements. However, application of the ratio needs its varying pattern because PM concentrations change significantly at time and space. Hourly PM2.5 and PM10 observations at nine monitoring sites in urban area (Urban-sites) and one remote Background-site in Wuhan in 2013–2015 were collected to investigate both long-term, short-term temporal variation and spatial distribution, spatial disparity of the ratio at a city scale. The results show that annual average PM2.5/PM10 ratio is 0.62 at Urban-sites and 0.68 at Background-site with apparent seasonal, monthly and daily variations. The ratio reaches the maximum in winter because of stable atmospheric conditions. There are apparent night-day differences of daily variation of the ratio, which increases at night in all seasons in consequence of temperature inversion and declines in the daytime with a moderate rise in the afternoon. We find obvious spatial gradients of the ratio that gradually increases from urban core to urban fringe and to suburban. This study provides further insights to the spatio-temporal variability of PM2.5/PM10 ratio. The evidence indicates that the variability of PM2.5/PM10 should be noticed in its applications.

Keywords

Air pollution Particulate matter Ratio Spatio-temporal variability China


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