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Health agencies and lab teams flag exposure pathways; small field test shows transfer to skin contact surfaces

6PPD State of the Science Forum (Day 1) · December 9, 2025
AI-Generated Content: All content on this page was generated by AI to highlight key points from the meeting. For complete details and context, we recommend watching the full video. so we can fix them.

Summary

Public‑health experts outlined evidence gaps for human exposure to tire chemicals and potential pathways, while a small Eurofins field experiment showed 6PPD quinone can transfer from street surfaces to a basketball and players' hands after 30 minutes of play.

Public‑health and analytical teams at the forum discussed what is known and unknown about human exposure to 6PPD and 6PPD quinone and identified priority data gaps for biomonitoring and exposure‑pathway evaluation.

Mallory Little, a toxicologist at the Washington State Department of Health, summarized available human and animal evidence and said both compounds are of concern though causality in observational human studies is unresolved. "Overall, we consider both 6PPD and 6PPD quinone to be…

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