Benzo[a]pyrene

CAS Number

50-32-8

Synonym

3,4-Benzopyrene; BaP; 3,4-Benz(a)pyrene; BP; Benzopyrene; NSC 21914

Occurrence/Use

Component of coal tar, diesel emissions, and smoke resulting from combustion of organic material, including tobacco smoke

Image of Chemical Structure of Benzo(a)pyrene

Soil Screening

Last CHHSL revision: 1/2005
CHHSL Comments:

For chemical-specific screening levels for use in assessing contaminated sites, please see HHRA Note 3 (DTSC HERO). https://www.dtsc.ca.gov/assessingrisk/humanrisk2.cfm

Cancer Potency Information

Latest Criteria: California Public Health Goals
Inhalation Unit Risk (μg/cubic meter)-1: 1.1 E-3
Inhalation Slope Factor (mg/kg-day)-1: 3.9 E+0
Oral Slope Factor (mg/kg-day)-1: 2.9 E+0
Comments/References:

OEHHA 2010. Public Health Goal for Benzo(a)pyrene in Drinking Water.
Note: The oral slope factor was adjusted by a combined age sensitivity factor of 1.7 to account for a 70-year lifetime exposure and increased sensitivity during early-in-life exposures.

OEHHA 2009. Air Toxics Hot Spots Program Technical Support Document for Cancer Potencies. Appendix B. Chemical-specific summaries of the information used to derive unit risk and cancer potency values. Updated 2011.

Air

Proposition 65

Chemical Status

Cancer: Currently listed

Cancer

Cancer - Listing Mechanism
State's Qualified Experts
Listed as causing : Listed as causing: Cancer
Date of Listing:

Safe Harbor Levels

No Significant Risk Level (NSRL)
0.06 µg/day
Cancer

Public notices related to this chemical

Water

California Public Health Goals Data

Health Risk Category: Carcinogenicity
Public Health Goal (mg/L): 0.000007
Public Health Goal - Download: 091610benzopyrene.pdf
Cancer Risk at PHG: 0.000001
MCL value (mg/L): 0.0002
Cancer Risk at MCL: 0.00003
Last PHG Revision : 2010