The historical data base of visual range at 137 surface synoptic meteorological stations is examined. The original observations of visual range each noon are converted to light extinction coefficient, BEXT= 24/VISIBILITY, a measure of haziness. The bext is summarized for each calendar quarter from 1948 to 1963 as percentiles of the distribution function, namely the 25th, 50th (median), 75th and 90th percentile. Detailed examination of station by station behavior indicate that the median is often obscured by an upper threshold of visual range reported. The results consist of trend graphs, as well as seasonal contour maps for each decade of the time period.