Characterization of PM2.5, PM2.5-10 and PM> 10 in ambient air, Yokohama, Japan

Firoz Khan, Yuichiro Shirasuna, Koichiro Hirano, Shigeki Masunaga

Research output: Contribution to journalArticle

121 Citations (Scopus)

Abstract

This study elucidated the characteristics of ambient PM2.5, PM2.5-10 and PM> 10 with water soluble ions, i.e., Cl-, NO3 -, SO4 2-, Na+, NH4 +, K+, Mg2+ and Ca2+ and carbonaceous aerosol, i.e., EC and OC in above size fractions from the samples collected for the period of 2007-2008. The total numbers of PM2.5, PM2.5-10 and PM> 10 samples collected with MCI sampler were 91, 87 and 79, respectively. The ambient particulate samples were collected twice in a week for a period of 24 h at the roof of a three-storied building in Yokohama National University. The annual arithmetic mean concentrations of PM2.5, PM2.5-10 and PM> 10 were 20.6, 9.6 and 5.1 μg m- 3, respectively. The results of the daily PM2.5 concentrations indicated that 67% of the daily PM2.5 exceeded USEPA National Ambient Air Quality Standards (NAAQS) (15 μg m- 3) while 95% in respect of WHO ambient air quality guidelines (10 μg m- 3). The concentrations of water soluble ions in PM2.5, PM2.5-10 and PM> 10 accounted for 40%, 31% and 19%, respectively. The estimation of non-sea-salt particles implies that the major sources of water soluble ions in PM2.5 are anthropogenic. On the other hand, a large proportion of sea salt particles contributes to PM2.5-10 and PM> 10. Spearman correlation indicated that the concentrations of OC and EC in PM2.5 can originate from similar type of sources. However, the concentration of OC and EC in PM2.5-10 and PM> 10 can have multiple sources. In addition, some atmospheric reactions were also characterized in this study.

Original languageEnglish
Pages (from-to)159-172
Number of pages14
JournalAtmospheric Research
Volume96
Issue number1
DOIs
Publication statusPublished - Apr 2010
Externally publishedYes

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ambient air
ion
air quality
sea salt
water
sampler
roof
aerosol
salt
particle
quality standard

Keywords

  • Carbonaceous aerosol
  • PM
  • PM
  • PM
  • Water soluble ions

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Characterization of PM2.5, PM2.5-10 and PM> 10 in ambient air, Yokohama, Japan. / Khan, Firoz; Shirasuna, Yuichiro; Hirano, Koichiro; Masunaga, Shigeki.

In: Atmospheric Research, Vol. 96, No. 1, 04.2010, p. 159-172.

Research output: Contribution to journalArticle

Khan, Firoz ; Shirasuna, Yuichiro ; Hirano, Koichiro ; Masunaga, Shigeki. / Characterization of PM2.5, PM2.5-10 and PM> 10 in ambient air, Yokohama, Japan. In: Atmospheric Research. 2010 ; Vol. 96, No. 1. pp. 159-172.
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