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Atmospheric Lead. A Success Story. The Natural State. Soil dust aerosols derived from rock weathering 0.010 ± 0.002 mg/ /year with some variation caused by changes in source For example: During the Younger Dryas (YD), background rates increased by a factor of 35. The Unnatural State.

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atmospheric lead

Atmospheric Lead

A Success Story

the natural state
The Natural State
  • Soil dust aerosols derived from rock weathering
  • 0.010 ± 0.002 mg//year with some variation caused by changes in source
  • For example: During the Younger Dryas(YD), background rates increased by a factor of 35
the unnatural state
The Unnatural State
  • Lead in Air
  • Petrol
  • Industrial Processes
  • Soil tillage and enhanced rates of soil erosion, thereby promoting the creation and release of soil dust
  • Lead Mining

By 1979, the lead flux had reached 15.7 mg//year, exceeding the natural flux by a factor of more than 1500