The effect of a ragweed pollen control program on hay fever

A STUDY of ragweed hay fever was conducted by the Department of Health of the City of New York during the summer of 1956. This study was made in an attempt to determine (1) whether a borough-wide program of ragweed eradication would result in significantly lower ragweed pollen counts in the treated borough than in other boroughs and (2) whether the ragweed ha! fever patients in the treated borough would experience fewer or less severe symptoms than their counterparts in other boroughs. A discussion of the results as they bear upon the first question appeared in a previous article.’