The PM2.5 and PM10 particles in urban areas of Taiwan

This study conducted an atmospheric aerosol sampling to measure the PM10 (particles < 10 microns in aerodynamic diameter) and PM2.5 (particles < 2.5 microns in aerodynamic diameter) mass concentrations from October 1996 to June 1997 in northern (Taipei), central (Taichung) and southern (Kaohsi...

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Bibliographic Details
Published inThe Science of the total environment Vol. 226; no. 2-3; pp. 227 - 235
Main Authors CHEN, M.-L, MAO, I.-F, LIN, I.-K
Format Journal Article
LanguageEnglish
Published Shannon Elsevier Science 09.02.1999
Subjects
Air Pollutants - analysis
Applied sciences
Atmospheric pollution
Cities
Dispersed sources and other
Exact sciences and technology
Particle Size
Pollution
Pollution sources. Measurement results
Seasons
Taiwan
Asia
Taiwan
Suspended particle
Particle size
Content
Aerosols
Check
Air pollution
Air quality
Urban area
Time variation
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Summary:This study conducted an atmospheric aerosol sampling to measure the PM10 (particles < 10 microns in aerodynamic diameter) and PM2.5 (particles < 2.5 microns in aerodynamic diameter) mass concentrations from October 1996 to June 1997 in northern (Taipei), central (Taichung) and southern (Kaohsiung), the three largest cities of Taiwan. Seventy-eight samples were obtained to measure the mass concentrations of PM10 and PM2.5 from nine sampling sites. According to those results, the PM10 mass concentrations in Taipei, Taichung and Kaohsiung were 42.19, 60.99 and 77.10 micrograms/m3, respectively. The corresponding PM2.5 mass concentrations were 23.09, 39.97 and 48.47 micrograms/m3, respectively. The PM2.5 fraction accounted for 61-67% of the PM10 mass in central and southern Taiwan, but was lower (54-59%) in northern Taiwan. Some samples in which the PM2.5 fraction was overwhelmingly dominant could reach as high as 80-95% of the PM10 mass. In addition, the PM2.5, PM10 levels and PM2.5/PM10-2.5 (particles with aerodynamic diameters ranging from 2.5 to 10 microns) ratios in metropolitan Taiwan significantly fluctuated from site-to-site and over time. Moreover, ambient daily PM2.5 and PM10-2.5 mass concentrations did not correlate well with each other at most of the sampling sites, indicated that they originated from different kinds of sources and emitted variedly over time.
ISSN:0048-9697
1879-1026
DOI:10.1016/S0048-9697(98)00407-0