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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

Listed as causing: 
Cancer
Date of Listing: 
07/01/1987
Basis for Listing: 
State's Qualified Experts

Safe Harbor Levels

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

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: 
Cancer Risk at PHG: 
0.000001
MCL value (mg/L): 
0.0002
Cancer Risk at MCL: 
0.00003
Last PHG Revision : 
2010