... 1950 1960 1970 1980 1990 1995 125 .4a 125 .8 129 .8 1 32. 8 135.0 129 .9 — 0.3 3.5 5.9 7.6 3.5 12. 8a 19 .2 28.4 36.4 41.4 39.7 — 50 122 184 22 3 21 0 a The rate of 1950 was used as basis of comparison From ... 1976 22 Murakami, M., Environmental health surveillance system for monitoring air pollution, Environ Sci., 4, 1, 1996 23 Nriagu, J.O., History of global metal pollution, Science, 27 2, 22 3, 1996 24 ... Chapter 12 © 20 01 by CRC Press LLC LA4154/frame/C 02 Page 16 Wednesday, May 17, 20 00 3:35 PM 16 ENVIRONMENTAL TOXICOLOGY 2. 4 REFERENCES AND SUGGESTED READINGS Time, Endangered Earth, January 2, ...