OE, and eventual approbation of, practices developed Trou recummenaations of responsible technical bodies. In particular, it is believed that while exposures of workers and the peneral population should be kept to the lowest practicable level at all times, the presently permitted exposures represent a level-.of risk so small compared with other hazards of life, and so well offset by perceptible benefits, that such approbation will be achieved when the informed public review process is completed," he concluded.