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The role of SO2 and COH (coefficient of haze) as causative factors in hospital emergency room admissions for respiratory and cardiac disease is analyzed using data from Chicago's Cook County Hospital. Some of the findings are that, while COH appears not to affect morbidity, SO2 does, with most important impacts being felt by those with cardiac disease, females, and the youngest and oldest age groups. It is concluded that marginal morbidity damages, about which little had been known, are not high relative to other damage categories. These damages are estimated to be on the order of 10 cents per microgram per cubic meter per person per year.
Fishelson et al. (Tue,) studied this question.