This project proformed the investigations of ambient particulate matters at four monitoring stations, Zhu-Shan, Taixi, Xin-Gang, and Puzi, in the Central and Yun-Jia-Nan Area. Water-soluble anions and cations of particulate samples were analyzed to understand chemical composition and the characteristics at each sampling site. Correlations between secondary aerosols and ozone were also investiged. The inferences of air quality due to dispersion, transportation, and primary pollutants emission were reviewed by the weather condition. High volumn particulate samplers were sited at Zhu-Shan and Taixi stations, and Dichomotous particulate samplers at the Xin-Gang and Puzi stations. The sampling was proformed every eight days during the period of January to early October, 2008. In the case of episodes of either particulate matter or ozone, sampling was continued for at least three days. High levels of particulate matters were detected mostly during February to April, 2008. A sand storm was claimed from February 29th to March 5th. The ozone episodes were occurred in May, September, and October. Due to poor dispersion, high concentrations of particulate matter and also the secondary NO3-, SO42- and NH4+, were detected often in March. The increase of nitrate was obvious during the events. While during the event of sand storm, rich calsium in PM10 were carried in. At the ozone episodes, significant increases of sulphate were measured, and secondary aerosols were found more related to O3,8hr rather than O3,max. Although Taixi station which near the industrial area would detect high SO2 occasionally, the correlations between secondary aerosols and primary pollutants were shown moderate. Zhu-Shan however revealed as a site with higher possibility for secondary aerosol formation. While it showed that transportation was more important at Xin-Gang and at Puzi area. By using the information of wind direction and air backward trajectory, the exhaust from the near industrial area may cause some pollution events occurred in Taixi and in Xin-Gang sampling sites. Polluted air parcel was trailed by passing through the coast then arriving at the inland sites.

PM10,PM2.5,soluble anion and cation, ozone