U.S. Pollutant Trends
1940-1995
¥
Most pollutants
decreased after the
1970 Clean Air Act
–
Lead
–
Particulates
–
SO
2
–
VOCÕs
–
CO
–
NO
2
is Leveling Off
Fig. 12-9, p.328
FIGURE 12.9 Emission estimates of six pollutants in the United States from1940–1995. (Data courtesy of United States Environmental Protection Agency.)
