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Probabilistic Reference and 10% Effect Concentrations for Characterizing Inhalation Non-cancer and

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This summary is machine-generated.

This study introduces a new method to estimate inhalation toxicity values for chemicals lacking regulatory assessment. The approach successfully identifies surrogate points of departure, expanding chemical safety evaluations.

Keywords:
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Area of Science:

  • Environmental Toxicology
  • Chemical Risk Assessment
  • Inhalation Exposure Science

Background:

  • Regulatory toxicity values are crucial for chemical management but are limited for inhalation exposure.
  • Existing reference concentrations (RfCs) cover only about 200 chemicals, creating a significant data gap.

Purpose of the Study:

  • To develop and validate a workflow for deriving surrogate inhalation route points of departure (PODs) and toxicity values for chemicals lacking regulatory assessments.
  • To expand the number of chemicals with available toxicity values for broader inhalation risk assessment.

Main Methods:

  • Curated and selected *in vivo* inhalation data from the U.S. EPA's ToxValDB.
  • Adjusted effect values to chronic human equivalent benchmark concentrations (BMCh) using the WHO/IPCS framework.
  • Validated the 25th percentile of BMCh distributions as a surrogate for regulatory PODs.

Main Results:

  • The 25th percentile of BMCh distributions demonstrated suitability as a surrogate for regulatory PODs (Q2 ≥ 0.76).
  • Derived surrogate PODs () for 2,095 substances with general non-cancer effects and 638 with reproductive/developmental effects.
  • Generated probabilistic RfCs and human population effect concentrations for a total of 2,160 substances.

Conclusions:

  • The developed workflow effectively expands the availability of toxicity values for a large number of chemicals.
  • This approach significantly enhances the capacity for comprehensive inhalation risk and impact assessments.