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ABSTRACT
The Norwegian-Russian border area is polluted by sulphur dioxide (SO2) emitted from a Russian nickel smelter in the city of Nikel. We studied the effects of daily variations in SO, on the lung function levels of people on both sides of the border. A cross-sectional population-based study was performed among adults in Sor-Varanger, Norway (n=3438) and Nikel, Russia (n= 1613). All subjects were assigned 24h mean SO2 concentrations for their day of screening and the day before on basis of residency. The SO;-con-centrations were compared with the daily recordings of forced expiratory volume in one second expressed as percentage of the predicted value (FEV1% predicted). In Sor-Varanger, no significant associations between SO, and FEV1% predicted were found. In Nikel, FEV1% predicted was exceeded non-systematically in some of the exposure categories (10-50, 50-90, or >90 μg/m3) compared to the reference exposure group (0-10 μg/m1). In conclusion, neither of the study populations suffered from a measurable reduction in lung function when SO2 increased above the reference level. (Int J Circumpolar Health 2001; 60: 342-359)