| Summary: | 碩士 === 國立成功大學 === 環境工程學系 === 86 === The air quality in southern Taiwan is the worst in Taiwan
due to the problems with PM10 and ozone. The purposes of this
study are tomeasure the characteristics of ambient PM10 in
southern Taiwan and to estimate the contributions from various
sources by using receptor model. The samplings of PM10 were
conducted simultaneously at 15 sites from November 1997 to
February 1998, the measurements continued for 3 days in each
month and the temporal resolution was six hours. The 24-hours
average mass concentrations of PM10 is from 15.6 mg/m3 to 141
mg/m3 ,and the water soluble chemical species such as Cl-、NO3-,
SO42-、Na+、NH4+、K+、Mg2+and Ca2+ were about 25~50% of PM10.
The concentrates of the most abundant species NO3-、SO42- and
NH4+ are about 2~8、6~23 and 4~8 mg/m3.Results of CMB modeling
analysis show that the fugitive sources、secondary aerosol and
diesel vehicles are the major sources of PM10 in southern
Taiwan. The contributions of the fugitive sources、secondary
aerosol and diesel vehicles for PM10 are 15.3~51.4%、11. 7~47.8%
and 7~16.3%, respectively. Contributions from local sources were
observed in some of the CMB analysis. For example,the
contributions of cement plant may be up to 10% at its downwind
sites. The contribution of sea salt was determined by the
distance from coast line and wind direction. Combining the
results from trajectory analysis and receptor modeling, the
contributions of various sources at different sites were
determined. For examples, the contributions of cement plant
decreased as air parcel moved downwind; the contribution of
diesel vehicles increased as air parcel transported into urban
area.
|
|---|
