Abstract
There has always been change but in many fields the tempo of current changes has been greatly increased.<sup>1</sup>Environmental health measures were formerly concerned mostly with living micro-organisms and their living vectors. They must now include nonliving long-range stresses. The development of large metropolitan areas extending far beyond city boundaries has brought with it problems of coordinated control and cooperative effort. It is estimated that over 50% of the population in the United States now lives in such metropolitan areas. With this increase in urbanization more attention must be paid to air pollution, the conservation and treatment of water supplies, and the disposal of domestic and industrial wastes including the recent and ever-increasing problem of redioactive wastes. Noise and the increasing pace of life with mounting internal tensions and mounting accident rates, especially those connected with traffic, are also problems awaiting solution. It has been said that human beings
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