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Suspended particles of PM 2.5 in air were sampled concurrently at an urban site and a rural site in Pingtung County in southern Taiwan, in the spring, the summer and the fall of 2005. All samples were analyzed to identify eight water-soluble ions, carbonaceous contents, and 19 metal elements.Measurements reveal that the overall means of PM 10 (and PM 2.5 ) are 59.2 (47.4) μg/m 3 at Pingtung (urban) site, and 63.6 (45.7) μg/m 3 at Chao-Chou (rural) site. Although both sites exhibited strong correlations (R = 0.98 at Pingtung, and R = 0.78 at Chao-Chou) between PM 10 and PM 2.5 masses, the mean PM 2.5 /PM 10 ratio was 0.81 at Pingtung, higher than 0.68 at Chao-Chou, suggesting that relatively large bare lands and outdoor burning on farms may have caused more coarse particles to be present in PM 2.5 at a rural site (Chao-Chou) than at an urban site (Pingtung

capability index, measurement system analysis, measurement system repeatability and reproducibility,

No abstract