1

Millions of People

PM-10 = particulate matter less than 10 ^m in diameter (dust and soot).

FIG. 5.1.3 People residing in counties that fail to meet NAAQS. Numbers are for 1991 based on 1990 U.S. county population data. Sensitivity to air pollutants can vary from individual to individual. (Reprinted from Council on Environmental Quality 1993.)

magnitude, frequency, duration, and relative contribution of these emissions. It can be used to measure past successes and anticipate future problems. The emission inventory is also a useful tool in designing air sampling networks. In many cases, the inventory is the basis for identifying air quality management strategies such as transportation control plans, and it is useful for examining the long-term effectiveness of selected strategies.

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