Key Findings of the ReassessmentExposure Document

• Environmental levels have declined since the ’70s

• Current US regulatory efforts have addressed most of the known large industrial sources

  • ~80% reduction between ’87 and ’95
  • Further reductions anticipated

• Open burning of household wastes is the biggest unaddressed contemporary source identified so far

• Many uncharacterized sources remain that could be significant

  • Burning, ceramics, forest fires, secondary steel, reservoir sources

• Exposure to general population has declined but currently averages ~~1 pg/kg/day

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