Abstract
Due to its reliability, simple and portable structure and low costs, the passive sampler is the ideal measuring device for developing countries. In spite of this, there has been no reporting on its reliability in extremely low temperate areas such as those associated with Northeastern China. The measuring of SO2 by passive samplers was attempted at extremely low temperatures in the heavy industrialized area of Shenyang, China from December 25 to 28,1995. The measurements associated with the passive sampler were accompanied by reference analysis utilizing conventional gas bubble sampling. The calibration equation generated from the parallel tests for the passive sampler at an extremely low temperature was 100×265×Wso2/t (‐11≈‐4°C, ppb). The annual average concentration of SO2, as sampled by the passive sampler, was 79ppb, 33ppb, and 24ppb in heavily polluted, intermediate and reference areas, respectively. The multi‐regressional analysis applied to data collected during the mornings (6: 00 am ‐8: 00 pm), afternoons (11: 00 am ‐ 1: 00 pm) and night (10: 00 pm ‐ 12: 00 pm) shows that SO2 concentrations in the morning and night were the most significant variables associated with daily concentration averages.
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