%1
Acute REL (μg/m3)
8700
Species
Rat
Acute REL Toxicologic Endpoint
Development
8-Hour Inhalation REL (μg/m3)
5
Last 8-Hour REL Revision
2025
Chronic Inhalation REL (μg/m3)
10
Chronic Target Organs
Respiratory system, male reproductive system
Human Data
No
Last Chronic REL Revision
2025
Chronic Reference Exposure Levels Comments
8-Hour Reference Exposure Levels Comments
Acute Reference Exposure Levels Comments
Last Acute REL Revision
2025
Ethylene Glycol
Chronic Inhalation REL (μg/m3)
400
Chronic Target Organs
Respiratory system, kidney, development
Human Data
Yes
Last Chronic REL Revision
2000
Chronic Reference Exposure Levels Comments
Benzene
Acute REL (μg/m3)
27
Species
Mouse
Acute REL Toxicologic Endpoint
Reproductive/ development; aplastic anemia and acute myelogenous leukemia
Acute REL Target Organs
Reproductive/ development, immune system, hematologic system
8-Hour Inhalation REL (μg/m3)
3
Last 8-Hour REL Revision
2014
Chronic Inhalation REL (μg/m3)
3
Chronic Target Organs
Hematologic system, nervous system, development
Human Data
Yes
Last Chronic REL Revision
2014
Chronic Reference Exposure Levels Comments
8-Hour Reference Exposure Levels Comments
Acute Reference Exposure Levels Comments
Severity
Severe
Last Acute REL Revision
2014
Epichlorohydrin
Acute REL (μg/m3)
1300
Species
Human
Acute REL Toxicologic Endpoint
Respiratory and eye irritation
Acute REL Target Organs
Respiratory system, eyes
Chronic Inhalation REL (μg/m3)
3
Chronic Target Organs
Respiratory system, eyes
Human Data
No
Last Chronic REL Revision
2000
Chronic Reference Exposure Levels Comments
Acute Reference Exposure Levels Comments
Severity
Mild
Last Acute REL Revision
1999
Propylene Glycol Monomethyl Ether
Chronic Inhalation REL (μg/m3)
7000
Chronic Target Organs
Alimentary system (liver)
Human Data
No
Last Chronic REL Revision
2000
Chronic Reference Exposure Levels Comments
4,4-Methylenedianiline
Chronic Inhalation REL (μg/m3)
20
Chronic Target Organs
Eyes, alimentary system (liver)
Human Data
No
Last Chronic REL Revision
2001
Chronic Reference Exposure Levels Comments
1,2-Dibromoethane
Chronic Inhalation REL (μg/m3)
0.8
Chronic Target Organs
Reproductive (decreased sperm count)
Human Data
Yes
Last Chronic REL Revision
2001
Chronic Reference Exposure Levels Comments
Chlorobenzene
Chronic Inhalation REL (μg/m3)
1000
Chronic Target Organs
Alimentary system (liver), kidney, reproductive system
Human Data
No
Last Chronic REL Revision
2000
Chronic Reference Exposure Levels Comments
Manganese & Manganese Compounds
8-Hour Inhalation REL (μg/m3)
0.17
Last 8-Hour REL Revision
2008
Chronic Inhalation REL (μg/m3)
0.09
Chronic Target Organs
Nervous system
Human Data
Yes
Last Chronic REL Revision
2008
Chronic Reference Exposure Levels Comments
OEHHA 2008. Technical Supporting Document for Noncancer RELs, Appendix D1. Updated July 2014. Listed as Manganese & manganese compounds.
8-Hour Reference Exposure Levels Comments
OEHHA 2013. Technical Support Document for Noncancer RELs, Appendix D1. Updated July 2014. Listed as Manganese & manganese compounds.
Propylene
Chronic Inhalation REL (μg/m3)
3000
Chronic Target Organs
Respiratory system
Human Data
No
Last Chronic REL Revision
2000
Chronic Reference Exposure Levels Comments