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476 CHAPTER 21 Air Pollution<br />

<br />

<br />

<br />

<br />

<br />

Future Trends for Urban Air Pollution<br />

The United States<br />

<br />

<br />

<br />

<br />

<br />

<br />

-<br />

<br />

2<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

-<br />

<br />

<br />

Developing Countries<br />

-<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

-<br />

<br />

<br />

70%<br />

60%<br />

63%<br />

Gross Decre<strong>as</strong>e Product<br />

50%<br />

45%<br />

40%<br />

30%<br />

20%<br />

10%<br />

20%<br />

21%<br />

Vehicle Miles Traveled<br />

Population<br />

0%<br />

–10%<br />

–20%<br />

Energy Consumption<br />

–30%<br />

–40%<br />

–50%<br />

90<br />

–41%<br />

95 96 97 98 99 00 01 02 03 04 05 06 07<br />

Aggregate Emissions<br />

(Six Common Pollutants)<br />

FIGURE 21.12 Change in United States population, gross domestic product, energy<br />

consumption, and aggregate emission of the six common air pollutants (ground-level ozone,<br />

particulates, lead, nitrogen dioxide, sulfur dioxide, and carbon monoxide) from 1990 to 2007.<br />

(Source: U.S. <strong>Environmental</strong> Protection Agency, 2008, air quality trends through 2007. www.epa.gov.

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