1. sulfur dioxide and nitrogen oxides
2. The source of most sulfur dioxide is high-sulfur coal burned in power plants. Controlling this source of sulfur dioxide production can have a major impact on acid rain in Pennsylvania and other regions of the Northeast.
3. Only 30 %of the nitrogen oxides causing acid rain come from power production. Automobiles generate another 30 percent and the agricultural sector contributes an additional 25 to 30 percent. Lightening strikes and biological processes produce the remaining nitrogen naturally. Consequently, it is much more difficult to control and regulate nitrogen oxides.
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