%1
Chronic Inhalation REL (μg/m3)
80
Chronic Target Organs
Alimentary system (liver); respiratory system
Human Data
Yes
Last Chronic REL Revision
2000
Chronic Reference Exposure Levels Comments
Carbon Tetrachloride
Acute REL (μg/m3)
1900
Species
Rat
Acute REL Toxicologic Endpoint
Reproductive/ development; hepatoxicity; headaches, nausea, vomiting
Acute REL Target Organs
Reproductive/ developmental, alimentary system (liver), nervous system
Chronic Inhalation REL (μg/m3)
40
Chronic Target Organs
Alimentary system (liver), development, nervous system
Human Data
No
Last Chronic REL Revision
2000
Chronic Reference Exposure Levels Comments
Acute Reference Exposure Levels Comments
Severity
Severe
Last Acute REL Revision
1999
Hydrogen Sulfide
Acute REL (μg/m3)
42
Species
Human
Acute REL Toxicologic Endpoint
Headache, nausea, physiological responses to odor
Acute REL Target Organs
central nervous system
Chronic Inhalation REL (μg/m3)
10
Chronic Target Organs
Respiratory system
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
Nickel Refinery Dust
Chronic Reference Exposure Levels Comments
See Nickel and Nickel Compounds.
8-Hour Reference Exposure Levels Comments
See Nickel and Nickel Compounds.
Acute Reference Exposure Levels Comments
See Nickel and Nickel Compounds.
Formaldehyde
Acute REL (μg/m3)
55
Species
Human
Acute REL Toxicologic Endpoint
Eye irritation
Acute REL Target Organs
Eyes
8-Hour Inhalation REL (μg/m3)
9
Last 8-Hour REL Revision
2008
Chronic Inhalation REL (μg/m3)
9
Chronic Target Organs
Respiratory 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 Formaldehyde.
8-Hour Reference Exposure Levels Comments
OEHHA 2013. Technical Support Document for Noncancer RELs, Appendix D1. Updated July 2014. Listed as Formaldehyde.
Acute Reference Exposure Levels Comments
OEHHA 2008. Technical Supporting Document for Noncancer RELs, Appendix D1. Updated July 2014. Listed as Formaldehyde.
Severity
Mild
Last Acute REL Revision
2008
Chlorine
Acute REL (μg/m3)
210
Species
Human
Acute REL Toxicologic Endpoint
Respiratory and eye irritation
Acute REL Target Organs
Respiratory system, eyes
Chronic Inhalation REL (μg/m3)
0.2
Chronic Target Organs
Respiratory system
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
Methyl Ethyl Ketone
Acute REL (μg/m3)
13000
Species
Human
Acute REL Toxicologic Endpoint
Respiratory and eye irritation
Acute REL Target Organs
Respiratory system, eyes
Acute Reference Exposure Levels Comments
Severity
Mild
Last Acute REL Revision
1999
Chloropicrin
Acute REL (μg/m3)
29
Species
Mouse
Acute REL Toxicologic Endpoint
Respiratory and eye irritation
Acute REL Target Organs
Respiratory system, eyes
Chronic Inhalation REL (μg/m3)
0.4
Chronic Target Organs
Respiratory system
Human Data
No
Last Chronic REL Revision
2001
Chronic Reference Exposure Levels Comments
Acute Reference Exposure Levels Comments
Severity
Mild
Last Acute REL Revision
1999
Selenium
Chronic Inhalation REL (μg/m3)
20 (inhalation); 5 μg/kg BW-day (oral)
Chronic Target Organs
Inhalation and oral: Alimentary system (liver), cardiovascular system, nervous system
Human Data
Yes
Last Chronic REL Revision
2001
Chronic Reference Exposure Levels Comments
OEHHA 2008. Technical Supporting Document for Noncancer RELs, Appendix D3. Listing is for Selenium and selenium compounds (other than hydrogen selenide). REL for hydrogen selenide listed separately.
1,2-Epoxybutane
Chronic Inhalation REL (μg/m3)
20
Chronic Target Organs
Respiratory system, cardiovascular system
Human Data
No
Last Chronic REL Revision
2000
Chronic Reference Exposure Levels Comments