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Botkin Environmental Science Earth as Living Planet 8th txtbk

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470 CHAPTER 21 Air Pollution<br />

Air pollutants<br />

SO 2 , NO x<br />

Acid precursors<br />

Transport and<br />

change, complex<br />

oxidation reactions<br />

H 2 SO 4 , sulfuric<br />

acid HNO 3 ,<br />

nitric acid<br />

Clouds<br />

Dry<br />

deposition<br />

Acid rain, snow,<br />

or fog<br />

Acid rain, snow,<br />

or fog<br />

Buildings<br />

and monuments<br />

Urban area<br />

power plants,<br />

vehicles, etc.<br />

Surface runoff<br />

Forest ecosystem Crops Urban area<br />

Pollution source<br />

Direction of wind flow and acid rain path<br />

FIGURE 21.6 Idealized diagram showing selected <strong>as</strong>pects of acid rain formation and paths.<br />

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Acid Rain’s Effects on Forest Ecosystems<br />

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Acid Rain’s Effects on Lake Ecosystems<br />

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