From the OEHHA:

The Office of Environmental Health Hazard Assessment (OEHHA) of the California Environmental Protection Agency is adding gallium arsenide to the list of chemicals known to the state to cause cancer and hexafluoroacetone, nitrous oxide and vinyl cyclohexene dioxide to the list of chemicals known to the state to cause reproductive toxicity for the purposes of Proposition 65. The listing of gallium arsenide, hexafluoroacetone, nitrous oxide and vinyl cyclohexene dioxide is effective August 1, 2008…

Cancer:

Gallium arsenide – CAS No. 1303-00-0

Reproductive Toxicity:

Hexafluoroacetone – CAS No. 684-16-2 – Male reproductive toxicity

Nitrous oxide – CAS No. 10024-97-2 – Developmental toxicity

Vinyl cyclohexene dioxide – CAS No. 106-87-6 – Female and male reproductive toxicity

Click on the above link for more information.

A recent release from the OEHHA: Extension of the Public Comment Period on the Proposed Listing of Gallium Arsenide as Known to Cause Cancer and Hexafluoroacetone, Nitrous Oxide and Vinyl Cyclohexene Dioxide as Known to Cause Reproductive Toxicity

On June 15, 2007 the Office of Environmental Health Hazard Assessment (OEHHA) published a notice in the California Regulatory Notice Register (Register No. 2007, 24-Z) announcing its proposal to add gallium arsenide [CAS No. 1303-00-0] to the list of chemicals known to the state to cause cancer, and hexafluoroacetone [CAS No. 684-16-2], nitrous oxide [CAS No. 10024-97-2] and vinyl cyclohexene dioxide [CAS No. 106-87-6] to the list of chemicals known to the state to cause reproductive toxicity, for the purposes of Proposition 65. The June 15 notice announced a July 16, 2007 public workshop and initiated a 30-day public comment period which was scheduled to close on July 16, 2007. OEHHA received a request to extend the comment period to allow for the submittal of relevant information. OEHHA hereby extends the public comment period to 5 p.m., Wednesday, August 15, 2007.

The full release is available here.

Notice from the OEHHA: Request for Comments on Proposed Listing of Gallium Arsenide as Known to Cause Cancer and Hexafluoroacetone, Nitrous Oxide and Vinyl Cyclohexene Dioxide as Known to Cause Reproductive Toxicity:

The California Environmental Protection Agency’s Office of Environmental Health Hazard Assessment (OEHHA) is the lead agency for the implementation of the Safe Drinking Water and Toxic Enforcement Act of 1986 (Health and Safety Code section 25249.5 et seq., commonly known as Proposition 65). OEHHA is proposing to add gallium arsenide [CAS No. 1303-00-0] to the list of chemicals known to the state to cause cancer, for the purposes of Proposition 65, and hexafluoroacetone [CAS No. 684-16-2], nitrous oxide [CAS No. 10024-97-2] and vinyl cyclohexene dioxide [CAS No. 106-87-6] to the list of chemicals known to the state to cause reproductive toxicity, for the purposes of Proposition 65.