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The World Meteorological Organization and the World Health Organization are sponsoring a Technical Conference on the Observation and Measurement of Atmospheric Pollution in Helsinki, Finland, July 30–August 4, 1973. An international exhibition of meteorological and pollution-measuring instruments, sponsored by the host country will be held from August 2 to 9, 1973. The call for papers has been issued with a deadline of March 1, 1973, for submission of abstracts.