Estimation of background PM2.5 concentrations for an air-polluted environment

Sheng Hsiang Wang, Ruo Ya Hung, Neng Huei Lin, Álvaro Gómez-Losada, José C.M. Pires, Kojiro Shimada, Shiro Hatakeyama, Akinori Takami

Research output: Contribution to journalArticle

Abstract

The background PM2.5 concentration represents the combined emissions from natural domestic and foreign sources, which has implications for the maximum effect, in terms of air-quality control, that can be achieved by reducing emissions. However, estimating the background PM2.5 concentration via background monitoring sites for a densely populated region (e.g., Taiwan) has been a challenge. In this study, we compared two statistical methods of estimating the background concentration using an 11-year time series (2005–2016) of data from three air-quality stations in Taiwan. The results of two methods showed good agreement for the background PM2.5 concentration estimation, which was about 4.4 μg m−3 and comparable to literature reports. According to the trend analysis, the concentration has decreased at a rate of 1–2 μg m−3 decade−1 as a result of better emissions control in East Asia in recent years. Furthermore, the local concentration can exceed the regional background value by up to 5 times due to local emissions, topographic effects, and weather regimes. When considering the cross-county transport of PM2.5, a difference as high as 5 μg m−3 exists between two prevailing-wind scenarios. This study provides crucial information to policy-makers on setting an achievable and reasonable goal for PM2.5 reduction.

Original languageEnglish
Article number104636
JournalAtmospheric Research
Volume231
DOIs
Publication statusPublished - 2020 Jan 1

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air
topographic effect
trend analysis
emission control
air quality
time series
weather
monitoring
method
effect
Asia
policy
county
air quality control
station
rate

Keywords

  • Air-quality monitoring networks
  • Background level
  • Hidden Markov Model
  • PM concentration

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Wang, S. H., Hung, R. Y., Lin, N. H., Gómez-Losada, Á., Pires, J. C. M., Shimada, K., ... Takami, A. (2020). Estimation of background PM2.5 concentrations for an air-polluted environment. Atmospheric Research, 231, [104636]. https://doi.org/10.1016/j.atmosres.2019.104636

Estimation of background PM2.5 concentrations for an air-polluted environment. / Wang, Sheng Hsiang; Hung, Ruo Ya; Lin, Neng Huei; Gómez-Losada, Álvaro; Pires, José C.M.; Shimada, Kojiro; Hatakeyama, Shiro; Takami, Akinori.

In: Atmospheric Research, Vol. 231, 104636, 01.01.2020.

Research output: Contribution to journalArticle

Wang, SH, Hung, RY, Lin, NH, Gómez-Losada, Á, Pires, JCM, Shimada, K, Hatakeyama, S & Takami, A 2020, 'Estimation of background PM2.5 concentrations for an air-polluted environment', Atmospheric Research, vol. 231, 104636. https://doi.org/10.1016/j.atmosres.2019.104636
Wang, Sheng Hsiang ; Hung, Ruo Ya ; Lin, Neng Huei ; Gómez-Losada, Álvaro ; Pires, José C.M. ; Shimada, Kojiro ; Hatakeyama, Shiro ; Takami, Akinori. / Estimation of background PM2.5 concentrations for an air-polluted environment. In: Atmospheric Research. 2020 ; Vol. 231.
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