A comparison of St. Louis and Winnipeg was made. St. Louis put out 13 times greater SO/sub x/, 7 times greater NO/sub x/, 6 times greater hydrocarbons, and twice the particulate (dustfall). Also, the St. Louis climate favors inversion and discourages dispersion. A study of 300 lungs by autopsy was performed. St. Louis had more emphysema cases: 7 times as many among 20- to 49-yr-olds, 2 times as many among 50- to 69-yr-olds, and 1.5 times as many in over-70 age group. Also a difference in severity was noted. Severe emphysema is uncommon in Winnipeg, whereas severe cases were encountered in every age group in St. Louis. No severe emphysema in non-smokers was found in either city. A synergistic effect between smoking and pollution is suggested.
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Ishikawa et al. (1969) studied this question.
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