AAAS Science and Human Rights ProgramAAASScience and Human Rights Program

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Environment and Human Rights Resources
   

Parts per billion (ppb)

"One ppb is comparable to one kernel of corn in a filled, 45-foot silo, 16 feet in diameter."

Source: United States Environmental Protection Agency, Office of Compliance and Assurance
   
AAAS Science and Human Rights Program
Copyright 2002