Do man-made sources affect the sulfur cycle of northeastern states?

EPA and EPRI studies on the effects of high levels of atmospheric sulfates reflect the situation of the early 1970's in the northeast. Emissions, deposition, and transportation; ground-level fluxes; soil-sulfur reactions and river removal; and cycle balance are examined. The health and welfare implications of widespread disruption of the natural ecosystem have only begun to be investigated. It will be important to consider the physical and chemical state of the sulfur in examining its health effects.