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Chemicals Listed Effective March 19, 2021 As Known to The State Of California to Cause Cancer: Molybdenum Trioxide and Indium Tin Oxide

Effective March 19, 2021, the Office of Environmental Health Hazard Assessment (OEHHA) is adding molybdenum trioxide (CAS No. 1313-27-5) and indium tin oxide (CAS No. 50926-11-9) to the list of chemicals known to the State of California to cause cancer for purposes of Proposition 65[1].  The listing of these chemicals is pursuant to the “Labor Code” listing mechanism[2].

The basis for the listings was described in a public notice published in the October 9, 2020, issue of the California Regulatory Notice Register (Register 2020, No. 41-Z). The title of the notice was “Notice of Intent to List Chemicals by the Labor Code Mechanism: Molybdenum Trioxide and Indium Tin Oxide.”  The publication of the notice initiated a 45-day public comment period[3].  We received one comment on molybdenum trioxide. The comment and OEHHA’s response are posted with the Notice of Intent to List.

A complete, updated Proposition 65 chemical list is available on the OEHHA website.

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Footnotes and References

[1]  The Safe Drinking Water and Toxic Enforcement Act of 1986, Health and Safety Code section 25249.5, et seq.

[2] Health and Safety Code section 25249.8(a) and Title 27 Cal. Code of Regs. section 25904.

[3] The comment period was extended an additional 15 days due to the COVID-19 Emergency.