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A striking instance of atmospheric transport of vegetable allergens is afforded by the figures for the incidence of Alternaria and Hormodendrum spores on October 6 and 7 throughout the eastern part of the United States. Weather bureau records show that on these two days air masses from the Northwest at elevations of from 2,000 to 6,000 feet moved rapidly southeastward and eastward, covering the distance from Minnesota to the Atlantic seaboard and the gulf in about fifty-five hours. During this time thousands of tons of mold spores were transported an average distance of several hundred miles. At nearly every station on and east of the Mississippi River where records were taken the catch of Alternaria spores during one or the other of the two days of the storm exceeded that found on any other day during the entire summer and fall. Figures were particularly high in Minneapolis, St. Louis, Memphis,
Durham OC. AN UNUSUAL SHOWER OF FUNGUS SPORES. JAMA. 1938;111(1):24–25. doi:10.1001/jama.1938.72790270001008
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