Fine and coarse particles were collected by Universal sampler, and some gas species were collected by annular denuder system from June 1999 to January 2000 in Sha-Lu, Taiwan. Concentrations of gas species (SO2, HNO2, HNO3, NH3, HCl) and salt species (NO2-, NO3-, SO42-, NH4+, Cl-, Mg2+, Ca2+, K+, Na+) in particulate phase were analyzed by ion chromatography. Two sites were set inside and outside the Hung-Kuang Institute of Technology, and measurements in two sites were carried out simultaneously. The site outside school was located on an overbridge above Chung-Chi Road, named as CCROB. The sampling site inside campus was located on the roof of an eight-story building, named as HKIT. Results showed that coarse particle concentrations measured at HKIT were obviously higher than that measured at CCROB. This was caused by highway construction just right behind the HKIT sampling site. Average concentrations of all gaseous pollutants measured in this study in HKIT was higher than CCROB. Both HNO2 and HNO3 concentrations were higher in winter and lower in summer. Taichung thermal power station was not the largest contributor of SO2 to the Sha-Lu area, factories spread over Long-Jin and Da-Du were possibly the major contributors of SO2. For the chemical composition of fine and coarse particles, sulfate and ammonium were distributed in fine particles, and nitrite, nitrate and chloride were distributed in coarse particles. The major salts existed in fine particle were (NH4)2SO4, and in coarse particles were salts of nitrite, nitrate and chloride. The sodium and chloride concentrations in coarse particles were highly positive related, indicated that the sea-salt aerosols were the major contributors to coarse particles.
