Distributions of the ambient atmospheric mixing ratios of OCS and CS2 were determined from grab samples collected at altitudes ranging from 6 to 8 km (20,000 to 26,000 feet) during an aircraft flight between San Juan, Puerto Rico, and Albany, New York (July 11-12, 1982). No spatial variation is observed for OCS mixing ratios at these altitudes and latitudes within the uncertainty of the collection and analysis techniques. The average OCS mixing ratio is 517¿65 pptv, where the standard deviation includes atmospheric as well as experimental variability. CS2 values, on the other hand, show considerable spatial variability that may be correlated with intense local cumulonimbus activity.