Gaseous Sulfur Pollutants from Urban and Natural Sources

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Abstract
Major aspects of the circulation through the atmospheric environment of sulfur pollutants have been estimated, including source magnitudes, residual atmospheric concentrations, and scavenging processes. The compounds considered include SO2 and H2S, as well as sulfates. One-third of the sulfur reaching the atmosphere comes from pollutant sources, mainly as SO2. Within the atmosphere there is a net transfer of sulfur from land to ocean areas. Pollutant sources annually amount to 73 × 106 tons as sulfur while natural sources amount to 142 × 106 tons, mainly as H2S and sulfate sea spray. More than two thirds of the natural and pollutant sulfur emissions occur in the northern hemisphere. When only pollutant emissions are considered, 93 per cent occur in the northern hemisphere.

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