From the OEHHA web site

Short version:

  • Exposures at the highest vapor concentrations cause uterine tumors in rats.
  • They are concerned about the potential non-carcinogenic effects associated with D5 and its apparent persistence in the environment and animal and human tissues.
  • It will not pose a risk to the public living near businesses.
  • It has not undergone formal evaluation for identification as a Toxic Air Contaminant (TAC).

Full version:

Health and Environmental Impacts
There is limited health information on these hydrocarbon mixtures. None of the hydrocarbon solvents have undergone formal evaluation by California for identification as toxic air contaminants (TAC). A detrimental and secondary health effect of the alternative solvents is that all hydrocarbon solvents are considered volatile organic compounds (VOC). VOCs contribute to the formation of ozone, which is linked to many ill-health effects including respiratory irritation, asthma, and premature death. VOC emitting systems require air permits.

All solvents adopted by the California OEHHA have been determined to create hazardous waste.