... 125 .4 a — 12. 8 a —1960 125 .8 0.3 19 .2 501970 129 .8 3.5 28 .4 122 1980 1 32. 8 5.9 36.4 1841990 135.0 7.6 41.4 22 31995 129 .9 3.5 39.7 21 0 a The rate of 1950 was used as basis of comparison.From ... 1996. 23 . Nriagu, J.O., History of global metal pollution, Science , 27 2, 22 3, 1996. 24 . Waldron, H.A., The blood lead level threshold, Arch. Environ. Health , 29 , 27 1, 1974. 25 . Kondo, ... DHHS Publication No.(PHS)9 7-1 23 2, July, 1997. LA4154/frame/C 02 Page 14 Wednesday, May 17, 20 00 3:35 PM© 20 01 by CRC Press LLC 10 ENVIRONMENTAL TOXICOLOGY Table 2. 1 Changing Causes of Death...