OEHHA adds warning requirement effective date for N‑methyl‑N‑formylhydrazine listing (warnings required starting Dec 8, 2026)

OEHHA’s listing notice for N‑methyl‑N‑formylhydrazine indicates that while the chemical was added to the Proposition 65 list as a carcinogen effective December 8, 2025, the warning requirement for significant exposures takes effect on December 8, 2026 (the 12‑month grace period). Compliance teams should ensure product exposure assessments, labeling/artwork changes, online warning updates, and supply-chain communications are completed ahead of the December 8, 2026 warning-trigger date for this substance.