Abstract
Examination of total deaths in New York City by day of occurrence shows periodic peaks in mortality which are associated with periods of high air pollution. These peaks are usually associated with periods of low wind speed and temperature inversion conditions which permit air pollution to build up to high levels. Unlike the experience of London, fog is not a necessary part of this picture, and therefore the presence of these episodes is often not apparent at the time to most inhabitants. A characteristic feature of these episodes is the immediate rise in mortality occurring on the same day as the peaks of pollution. A second characteristic is their frequent influence on death rates in the 45- to 64-year age group as well as in those over 65. These characteristics suggest that if these excess deaths are related to air pollution, the mechanism is probably protean and pervasive, affecting the course of a variety of different diseases through a basic physiologic effect. 5 figures.
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