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Acid Rain Program 1999 Progress Report

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In 1990, Congress established the Acid Rain Program under the Clean Air Act. The principal goal of the program is to achieve reductions of 10 million tons of sulfur dioxide (SO2) and 2 million tons of nitrogen oxides (NOx), the primary components of acid rain. These pollutants, in their various forms, lead to the acidification of lakes and streams rendering some of them incapable of supporting aquatic life. In addition, they impair visibility in our national parks, create respiratory and other health problems in people, weaken forests, and degrade monuments and buildings.

This report describes progress made by the Acid Rain Program to address this environmental problem. It provides both basic information about the nature of acid deposition and detailed descriptions of how key indicators have changed.


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