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6th day air mass air pollution agencies AIR POLLUTION EPISODE Air Pollution Potential air quality data Air Sampling Network ALERT FORECAST buildup of pollutants CAMP cities CAMP station Chicago curves in Figure Data from CAMP days of stagnation December 2-3 diurnal variations Division of Air Dosage duration EASTERN UNITED England episode period Gaseous Pollutants high pressure high-pressure system hydrocarbon levels increased indicated maxima Meteorology minor low-pressure system N. Y. Metropolitan Area NASN National Air Sampling Niemeyer northern November November 27 NOVEMBER 30 Ohio oxidant measurements Pennsylvania persistence Philadelphia plots Pollutant levels pollution buildup Pollution Potential Forecast Potential Forecast Program pressure system public health agencies Public Health Service public reaction ratio replies requested rose September 1963 stag stagnant air Stagnating Anticyclones stagnation area stagnation period stagnation situation sulfate Taft Sanitary Engineering ticulate tions total hydrocarbon twice normal U.S. Weather Bureau ventilation Washington Weather Bureau Research weather stations York City