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21.1 Air Pollution in the Lower Atmosphere 471<br />

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12<br />

Acid Rain’s Effects on Human Society<br />

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11<br />

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Control of Acid Rain<br />

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2 <br />

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Air Toxics<br />

air toxics -<br />

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Hydrogen Sulfide<br />

2 <br />

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Hydrogen Fluoride<br />

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1

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