170
250
200
Pounds or Toxicity Units
50
0
1987
1989
1991
1993
1995
1997
1999
2001
2003
2005
2007
100
150
100's of millions of Pounds
Millions of Toxicity Units
Year
FIGURE 10.3 Yearly TRI releases (pounds) and toxicity units from 1988 through 2007.
Toxic Chemicals