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Atmospheric H2S was measured by a fluorometric method (sensitivity 10 rig). In France, for aerated soils the emissions were between 0.8 and 27/•g m -2 h -t H2S (average 5/•g m -2 h-•). The soil temperature is an important factor governing this emission. The H2S concentrations in the air ranged from 0.017 to 0.17 gg m -3 (average 0.080/•g m-3). In the Ivory Coast the H•S emissions were estimated between 30 and 300 p.g m -• h -t. The measured concentrations of H2S in the air at ground level ranged from 0.10 to 8.7 t•g m -3. The relative importance of the measured emissions for anoxic soils of the humid equatorial forests in the global $ cycle is discussed.

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