Days of high air pollution potential forecasted -- Average annual afternoon mixing depth -- Average annual wind speed through mixing depth -- Afternoon ventilation in spring -- Afternoon ventilation in summer -- Afternoon ventilation in winter / compiled by the U. S. Geological Survey from data provided by the National Center for Air Pollution Control, now the National Air Pollution Control Administration, Public Health Service, Department of Health, Education, and Welfare. (with) Estimated annual emissions and concentrations of sulphur dioxide : 1961-1965 -- Estimated annual concentration of suspended particulates and nitrogen dioxide : 1961-1965 / compiled from information provided by U. S. Public Health Service.
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