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21.1 Air Pollution in the Lower Atmosphere 473<br />

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Haze from Afar<br />

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-<br />

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16<br />

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Urban Air Pollution: Chemical<br />

and Atmospheric Processes<br />

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smog<br />

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Sulfurous smog <br />

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Photochemical smog <br />

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2 -<br />

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2 3 <br />

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2 -<br />

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Concentration (ppm)<br />

0.12<br />

0.10<br />

0.08<br />

0.06<br />

0.04<br />

NO<br />

NO 2<br />

HC 10<br />

0.02<br />

Ozone<br />

Midnight 6 AM Noon 6 PM Midnight<br />

FIGURE 21.7 Development of photochemical smog over the<br />

Los Angeles area on a typical warm day.

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