Mass-size distributions of particulate sulfate,nitrate,and ammonia in the nonattainment air quality basin in southern taiwan

摘要

Concentrations and distributions of three major water-soluble ion species (sulfate,nitrate,and ammonia) contained in ambient particles were measured at field sites in the Kao-ping basin located in southern Taiwan.The air basin has been classified as nonattainment region of particulate and ozone since mid-1990's.In the years from 2001 to 2003,there were 6,19,and 33 ambient air quality episode days due to PM_(10) at these ambient air quality monitoring stations,respectively.A recent study conducted by Lin (2002a) showed that sulfate,nitrate,and ammonia dominated the identifiable components within both fine (PM_(2.5)) and coarse (PM_(2.5-10)) fractions.Although the study measured the fine and coarse particles at various urban sites,none has been made to investigate the relative difference of mass-size distribution.