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KMID : 0371020010340040316
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Journal of Preventive Medicine and Public Health
2001 Volume.34 No. 4 p.316 ~ p.322
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Summertime Heat Waves and Ozone
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Sung Joo-hon
Kim Ho
Cho Soo-Hun
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Abstract
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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, teather 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 (Cl) = 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% Cl =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.
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KEYWORD
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Ozone, Heat wave, Cardiopulmonary mortality, Air pollution
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