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Second level
Third level
Fourth level
Fifth level
density
http://www.environment.gov.au/atmosphere/airquality/publications/sok/lead.html
Torrens River Adelaide has Pb, Zn in excess of national guidelines
due to chemical industry.
Concentration is 0.5% nearly mineable!
http://www.environment.gov.au/atmosphere/airquality/publications/sok/mercury.html
0.3
micrograms Hg/L of blood is average for the general population
In Nambija (Ecuador) children reach 89 micrograms/L