Effective April 22, 2016, the California Office of Environmental Health Hazard Assessment (OEHHA) added styrene to the Proposition 65 list of chemicals known to cause cancer. Styrene’s listing has been in the pipeline for many years based on formal identification by the National Toxicology Program (NTP) that the chemical is “reasonably anticipated to be a human carcinogen.”
Concurrently with the listing, OEHHA also proposed a No Significant Risk Level (NSRL) for styrene of 27 micrograms per day.
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