Carbon disulfide (CS2) measurements were made over the western and equatorial North Atlantic Ocean and the northwestern and equatorial South Atlantic Ocean. Carbon disulfide was in the range 0.4--50 pptrv in the atmosphere of the western North Atlantic Ocean. Emissions from anthropogenic sources and wet lands were found to be important although anthropogenic sources were 4--6 times larger than biogenic sources. The flux of CS2 from eastern North America between 30 and 39¿ latitude was estimated to be 2¿108g yr-1 of sulfur. The anthropogenic contribution was 1.8¿108g yr-1 of sulfur whereas the contribution of marshes was 0.2¿108g yr-1 of sulfur. Sources of CS2 at high latitudes in the northern hemisphere were comparatively weak. Carbon disulfide levels in the western South Atlantic Ocean between -5 and 1¿ latitude were in the range 0.2--6 pptrv. Most of the CS2 appeared to come from biomass burning in Africa. Carbon disulfide was much higher close to shore suggesting that the South American continent was a significant source although too few data were available to quantify it. On ferry flights from Wallops, Virginia to Natal, Brazil, CS2 levels at the ferry altitude of about 6 km averaged 1.2 pptrv. This background CS2 was adequate to account for all the OCS in the atmosphere. ¿ American Geophysical Union 1993