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Korean Journal of Preventive Medicine 2001;34(4): 316-322.
Summertime Heat Waves and Ozone : an Interaction on Cardiopulmonary Mortality? - Based on the 1994 Heat Wave in Korea -.
Joohon Sung, Ho Kim, Soo Hun Cho
1Department of Preventive Medicine, Kangwon National University College of Medicine, Korea.
2Department of Epidemiology and Biostatisitcs, School of Public Health, Seoul National University, Korea.
3Department of Preventive Medicine, Seoul National University College of Medicine, Korea.
4Institute of Environmental Medicine, SNUMRC, Korea.
ABSTRACT
OBJECTIVES: To explore the possible effect of an interaction between summertime heat waves and ozone on cardiopulmonary mortality during the 1994 heat wave in Korea. METHODS: The unusually hot summer of 1994 in Korea was defined as the heat wave in this study. We examined the associations of air pollutants with daily cardiopulmonary deaths between 1991-1995, considering the product term of the heat wave and each pollutant, weather and time trends. RESULTS: During the heat wave, while temperatures were uniformly higher than those of other summers, the within-heat-wave difference in mortality paralleled that in the regional ozone levels. In terms of the influence of the heat wave, the results of ozone were different to those of total suspended particles (TSP) and sulfur dioxide (SO2). The ozone association (relative risk (RR) =1.036; 95% confidence interval (CI) = 1.018-1.054) was observed only under heat wave conditions, while the TSP (RR =1.006, 95% CI = 0.999-1.012) and the SO2 (RR =1.018, 95% CI = 1.011-1.024) associations were found under normal weather conditions (per interquartile increase of each pollutant; results of three pollutants model). The ozone association under heat wave was attributable to the statistical interaction between the heat wave and ozone. CONCLUSIONS: These results support the possibility of a biological synergy between the heat wave and ozone, one that is not evident between the heat wave and other major pollutants like particles or SO2.
Key words: Ozone; Heat wave; Cardiopulmonary mortality; Air pollution
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