Acid Precipitation: Causes and Consequences

Abstract

The first of a three-part series explores the causes and consequences of the acid-rain phenomenon which is spreading rapidly across the US. Sulfur and nitrogen oxides from industrial and automotive emissions combine with atmospheric water to form dilute acids that can be transported long distances until they fall as rain. The effects on the abiotic and biotic components of both the terrestrial and aquatic ecosystems are being monitored to determine the amount of toxicity that results from changing the pH effect and to determine how widespread the geographical effects range. Reduced fossil-fuel combustion and higher emission standards will not prevent acid rain from becoming an international problem, according to Environmental Protection Agency forecasts. 74 references. (DCK)