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Botkin Environmental Science Earth as Living Planet 8th txtbk

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474 CHAPTER 21 Air Pollution<br />

(a)<br />

FIGURE 21.8<br />

The city of Los Angeles on (a) a clear day and (b) a smoggy day.<br />

(b)<br />

<br />

<br />

-<br />

<br />

<br />

<br />

<br />

-<br />

<br />

<br />

<br />

<br />

-<br />

<br />

atmospheric inversion <br />

<br />

<br />

<br />

<br />

-<br />

<br />

<br />

-<br />

<br />

Elevation<br />

Sea<br />

breeze<br />

Inversion layer<br />

Descending warm air<br />

Mountains (geological barrier)<br />

FIGURE 21.9 Two causes of<br />

the development of atmospheric<br />

inversion, which may aggravate<br />

air-pollution problems.<br />

Temperature<br />

Relatively warm air (inversion layer)<br />

Elevation<br />

Relatively cool air<br />

Temperature<br />

Valley

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