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