Ethylene Glycol N-Momo Butyl Ether (EGBE) RELS – Scientific Review Panel on Toxic Air Contaminants (SRP) Review Draft

California’s Office of Environmental Health Hazard Assessment (OEHHA) is releasing a Scientific Review Panel on Toxic Air Contaminants (SRP) review draft document summarising the toxicity and derivation of relative exposure limits (RELs) for Ethylene Glycol n-mono Butyl Ether (EGBE). These documents will be reviewed and discussed by the SRP at their meeting on 4 March 2016. RELs are airborne concentrations of a chemical that are not anticipated to result in adverse non–cancer health effects for specified exposure durations in the general population, including sensitive subpopulations. OEHHA is required to develop guidelines for conducting health risk assessments under the Air Toxics Hot Spots Program (Health and Safety Code Section 44360(b)(2)). In response to this statutory requirement, OEHHA develops RELs for many air pollutants. The EGBE RELs were developed using the most recent “Air Toxics Hot Spots Program Technical Support Document for the Derivation of Noncancer Reference Exposure Levels,” finalised by OEHHA in 2008. A draft of the EGBE REL document was released for a 60-day public review and comment period on 14 August 2015. One set of comments was received. Responses to these comments are also being released at this time. The values proposed are as follows:

  • Acute REL (for a 1–hour exposure): 4700 micrograms per cubic metre (µg/m3)
  • 8–Hour REL (for repeated 8–hour exposures): 150 µg/m3
  • Chronic REL (for long–term exposures): 77 µg/m3

We are not seeking further comments from the public on the draft document.

Further information is available at:

OEHHA, 3 February 2016 ;http://www.oehha.ca.gov ;