The characteristic study of TSP, PM and PM in 2.5;10 2.5 the rural site of central Taiwan

The total suspended particle TSP., PM2.5;10 aerodynamic diameter less than 10 mm. and PM2.5 concentration aerodynamic diameter less than 2.5 mm. concentrations were sampled by PS-1 and Universal sampler on the roof 25 m. of the Medical and Engineering Building in the campus of Hungkuang Institute of Technology HKIT. which is located at a height of 500 m on Da Du Mountain. The results indicated that average TSP, PM2.5;10 and PM2.5 concentrations are 0.42, 0.34 and 0.019 mgrm3 in the day time, respectively and are 0.32, 0.26 and 0.017 mgrm3 in the night time, respectively. The ratios of PM2.5;10rTSP were from 76% to 85% and from 50% to 91% for day and night period, respectively. It indicated that the major composition in the total suspended particles was PM2.5;10 in the rural site. The relationship between TSP and PM2.5;10 is TSPs1.16PM2.5;10q0.027 and TSPs1.01PM2.5;10 q0.058 in the day and night time, respectively. The correlation coefficient R2. is 0.98 and 0.97 for day and night period, respectively. The relationship between PM2.5;10 and PM2.5 is PM2.5s0.0005PM2.5;10q0.019 and PM2.5s 0.037PM2.5;10q0.0076 in the day and night period, respectively. The correlation coefficient R2. is 3E-5 and 0.67 for day and night period, respectively. The relationships between TSP, PM2.5;10 , PM2.5 particle concentrations and wind speed R2. in the day time are 0.71, 0.64, 0.43, respectively and are 0.83, 0.79, 0.57, respectively in the night time. The proposed reasons are that there are more activities caused by people students. and natural living animals which absorbed some of the particles during the day time. Thus, the correlation coefficients for the night time are better than those of day time. The particle size distributions are both bimodel in the day and night time. The major peaks in the day time appear in the particle diameter between 0.031;0.056 mm and 3.16;5.62 mm in the day period and appear between 0.017;0.031 mm and 1.78;3.16 mm in the night period. The results indicate that the particle size distribution in the day time tends to be of larger particle size mode than the night time.