aT eee "eooling” time for short-lived radioactive materials to decay away, by off-gas cleaning, and by scheduling release of materials with due regard to meteorological conditions at the time, This is a section on possible uses of radioactive materials in the study of the sclence of meteorology. Natural radon gas in the air can be helpful in understanding verticle movements of air from the land, Weapons tests have taught much with respect to lateral spread of air masses at various altitudes - how rain scavenges the atmosphere of particles - the rate of transport from the stratosphere to the troposphere and the removal time for water from the atmosphere, Experiments could be conducted using introduced radioactive materials under controlled conditions to study air flow and diffusion rates, hydrometeorology, 1.e., condensation, precipitation and evaporation, and to study electricity of the atmosphere especially the possible relationship of electrical fields to the weather, As to effects of nuclear weapons testing on the weather the committee stated: 1, Nuclear Weapon debris was not effective as a seeder for rain, 2, The amount of lonization produced is insignificant in meteorological terms, 3, There has been no measurable decrease in the amount of direct sunlight reaching the earth whereas volcanoes have been known to decrease it by as much as 10-20% for appreciable periods of time, 4, The apparent recent increase in severe storms is probably the result of “improved methods of reporting," Committee on the Effects of Atomic Radiation, Oceanography and Fisheries - Chairman, Roger Revelle, Scripps Institute of Oceanography This group viewed the past record of this country with respect to pollution of streams, waterways and harbors with extreme - lo - Enclosure IT