NEWS


• December 2023: OARS WEEL documentation for Methyltrimethoxysilane is available for public comment. The comment period has been extended from September 23 through January 19, 2024. To obtain a copy and submit comments please contact Dr. Patricia McGinnis at mcginnis@tera.org.

• October 2023: The semi-annual OARS WEEL committee meeting will be held on October 26-27 in South San Francisco, CA. The session is in-person and also via Zoom.

• September 2023: OARS WEEL documentation for bis-(2-Chloroisopropyl) Ether is available for public comment from September 23 through October 22, 2023. To obtain a copy and submit comments please contact Dr. Patricia McGinnis at mcginnis@tera.org.

• September 2023: OARS WEEL documentation for Methyltrimethoxysilane is available for public comment from September 23 through October 22, 2023. To obtain a copy and submit comments please contact Dr. Patricia McGinnis at mcginnis@tera.org.

• April 2023: The “Workplace environmental exposure level guide (WEEL) for Triethylenetetramine (TETA)” was published in Toxicology an Industrial Hygiene 39(4): 183-187.

• March 2023: The semi-annual OARS WEEL committee meeting was held March 23-24 in Nashville, TN.

• March 2023: The poster, “The Impact of Workplace Environmental Exposure Levels (WEELs)” was presented by TERA at the March 2023 Society of Toxicology Meeting. Click on image below to view full size version.

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• March 2023: The WEEL Committee welcomes four new members:
Lisa Michelle Cooper, MS; Theresa Repaso-Subang, RPBio, DABT, ERT, QPRA;
Bradley Thomson, MS; Elizabeth Vancza, PhD, DABT

• March 2023: The semi-annual OARS WEEL committee meeting will be held on March 23, 1-4pm CDS and March 24, 10am-3pm CDS in Nashville, TN. The session is in-person and also via Zoom.

• February 2023: OARS WEEL documentation for Triethyleneamine (TETA) has been finalized, posted, and submitted to Toxicology and Industrial Health.



NEWS ARCHIVES



The OARS-WEEL Committee consists of volunteer experts dedicated to the science of setting occupational exposure levels. The Committee strives for a balance of toxicology and industrial hygiene professionals with a broad base of experience from industry, government, academia, and consulting services. Each member serves on the Committee solely in his/her individual capacity and not as a representative of his/her employer, organization and/or agency.

OARS-WEEL 2023 Executive Committee


Chair: Jessica Graham, PhD, DABT
Vice Chair: Stacy Barnett, BS
Secretary: Ann Parker, MS 
Past Chair: Leslie Beyer, MS, DABT, CIH

OARS-WEEL 2023 Full Committee Members


Daniel E. Arrieta, MS, PhD, DABT, ERT
Joel Bercu, PhD, MPH, DABT
Courtney M. Callis, MPH, DABT
Patrick Coin, PhD
Michelle Deveau, PhD, ROH, CRSP
Christine Glatt, MS, DABT
Janet Gould, PhD., DABT, CIH
Andrew A. “Tony” Havics, CIH, PE
Sophie Jia, MD, PhD, DABT
Mark Jonesku, MS, CSP, CIH
Mark Korchinski, MSc, DABT, ERT

Tom Lewandowski, PhD, DABT, ERT, ATS
Andrew Maier, PhD, DABT, CIH
Melisa Masuda-Herrera, MS
Robert Roy, PhD, DABT, Fellow ATS
Lawrence M. Segal, PhD, ERT
Robert Skoglund, PhD, DABT, CIH, CPPS
Andrew Soiefer, PhD, DABT (1990-2020)
Kenneth Still, PhD, ATS, CIH, CSP, CHMM
Ann Tveit, PhD, DABT
James Weldy, CIH, CPH


OARS-WEEL 2023 Associate Members

Bill Brock, PhD, DABT, Fellow ATS
David Clapin, PhD, MPA, DABT (2003-2018)
Lisa Michelle Cooper, MS
Michael Cooper, MS, MPH, NRRPT, CIH
Chandrika Moudgal, MS
Sandeep Mukhi, PhD, DABT

Robert Nocco, MS, DABT, CIH, CSP, CFPS, RRPT
Theresa Repaso-Subang, RPBio, DABT, ERT, QPRA
Bradley Thomson, MS
Henry Trochimowicz, MS, ScD
Elizabeth Vancza, PhD, DABT
Brittany Wheldon, PhD



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Workplace Environmental Exposure Levels (WEELs)™ are health-based guide values for chemical stressors. The WEELs provide air concentrations intended to protect most workers from adverse health effects related to occupational chemical exposures.

Click here for the WEEL's table of values

OARS WEEL TABLE


Occupational exposure limits (OELs) are developed for protection of healthy workers; they are not intended for the general public, which includes sensitive populations such as infants, the elderly, or the infirm. OELs are based on repeated daily exposures over a working lifetime. They are normally averaged over an 8-hour workday and serve to protect against acute and chronic health effects.


Click Here to download the PDF version of the table


 

 

Substance CAS Source 8-Hour TWA Ceiling or Short-
Term TWA
Last Revised
Acetone Cyanohydrin 75-86-5 AIHA 2 ppm (skin) 5 ppm (15 min, skin) 1992
Acetophenone 98-86-2 AIHA 10 ppm   2007
Aldicarb 116-06-3 AIHA 0.01 mg/m3 (skin) 2009
Allyl lsothiocyanate 57-06-7 AIHA 1 ppm (15-min, skin,
DSEN)
1993
Aminobenzoic Acid, para- 150-13-0 AIHA 5 mg/m3   2001
Aminotri (Methylenephosphonic Acid) 6419-19-8 AIHA 10 mg/m3   2004
Amyl Alcohol, n- 71-41-0 AIHA 100 ppm   2001
Benzaldehyde 100-52-7 AIHA 2 ppm 4 ppm (15-min,
DSEN)
1998
Benzenesulfonicacid, 5-chloro-2((2-Hydroxy-1
napthalenyl)-azo)-4-methyl, barium salt (2:1)
5160-02-1 AIHA 1 mg/m3   2008
Benzophenone 119-61-9 AIHA 0.5 mg/m3   2003
Benzoyl Chloride 98-88-4 AIHA 5 ppm (ceiling, skin,
DSEN)
2008
Benzyl Alcohol 100-51-6 AIHA 10 ppm   2008
Butylcatechol, 4-tert- 98-29-3 AIHA 2 mg/m3 (ceiling,
skin, DSEN)
2001
Butyraldehyde 123-72-8 OARS 25 ppm (75 mg/m3) 2016
Chloramphenicol 56-75-7 AIHA 0.5 mg/m3   2008
ChIoroisopropyI)Ether, bis-(2- 39638-92-9 AIHA 3 ppm   2009
Chloropropane, 2- 75-29-6 OARS 50 ppm (161 mg/m3) 2016
Chlorosulfonic Acid 7790-94-5 OARS     2016*
Chlorotrifluoroethylene 79-38-9 AIHA 5 ppm   2010
Cumene Hydroperoxide 80-15-9 AIHA 1 ppm (skin) 2009
Decabromodiphenyl Oxide 1163-19-5 AIHA 5 mg/m3   2009
Decafluoropentane, 1,1,1,2,3,4,4,5,5,5- (HFC- 4310mee) 138495-42-8 OARS 225 ppm (2320 mg/m3) 700 ppm (7217
mg/m3)
2020
Decamethylcyclopentasiloxane (D5) 541-02-6 OARS 10 ppm   2015
Decene, 1- 872-05-9 AIHA 100 ppm 2000
Dehydrolinalool 29171-20-8 AIHA 2 ppm 2007
Diallylamine 124-02-7 AIHA 1 ppm (skin)   2009
Dibromoneopentyl Glycol 3296-90-0 AIHA 0.2 mg/m3   2010
Dibutylamine 111-92-2 AIHA   5 ppm (ceiling, skin) 2003
Dichlorophenol, 2,4- 120-83-2 AIHA 1 ppm (skin*) 2004
Diethylbenzenes, mixed isomers 25340-17-4 AIHA 5 ppm   2005
Diethylene Glycol 111-46-6 OARS 10 mg/m3   2016
Diethylene Glycol Monoethyl Ether 111-90-0 AIHA 25 ppm   1991
Difluoroethane, 1,1- 75-37-6 AIHA 1000 ppm   2005
Difluoroethane, 1-ChIoro-1,1- 75-68-3 AIHA 1000 ppm 1994
Difluoroethylene, (E)-1,2  (HFO-1132 (E) 1630-78-0  OARS 350 ppm    2022
Difluoromethane 75-10-5 AIHA 1000 ppm   1997
Diisobutylene 25167-70-8 OARS 75 ppm (344 mg/m3 )   2016
Dimethyl Ether 115-10-6 OARS 1000 ppm   2022
Dimethyl Sulfoxide 67-68-5 AIHA 250 ppm 2003
Dimethyl Terephthalate 120-61-6 AIHA 5 mg/m3 (total) 2000
Dimethyldichlorosilane 75-78-5 AIHA   2 ppm (ceiling) 2001
Dimethylethylamine 598-56-1 AIHA 1 ppm 3 ppm 2011
Dimethyl-para-toluidine, n,n- 99-97-8 AIHA 0.5 ppm   2009
Dinitroanisole, 2,4- (DNAN) 119-27-7 OARS 0.1 mg/m3 (0.01 ppm)   2014
Dowtherm Q 612-00-0,
68987-42-8
AIHA 7.8 mg/m3   2002
Epoxybutane, 1,2- 106-88-7 AIHA 2 ppm   2003
Erythromycin 114-07-8 AIHA 3 mg/m3   2007
Fluoroethane, 1,1-dichloro-1- 1717-00-6 AIHA 500 ppm 3000 ppm (5-min
STEL)
2008
Furan 110-00-9 AIHA Worker exposure by all
routes should be minimalized to the fullest extent possible.
  1993
GlycidylMethacrylate 106-91-2 AIHA 0.5 ppm (skin, DSEN) 2000
Glyoxal 107-22-2 AIHA 0.1 mg/m3 (DSEN)   2000
Hexadiene, 1,4- (mixed cis and trans) 592-45-0 AIHA 10 ppm 2009
Hexafluoro-2-butene, cis-1,1,1,4,4,4- (HFO
1336mzz-Z)
692-49-9 OARS 500 ppm (3350 mg/m3) 2014
Hexafluoro-2-butene, trans-1,1,1,4,4,4- (HFO
1336mzz-E)
66711-86-2 OARS 400 ppm (2680 mg/m3) 2018
Hexafluoropropane, 1,1,1,3,3,3- 690-39-1 AIHA 1000 ppm   1998
Hexamethyldisilazane (HMDZ) 999-97-3 OARS 10 ppm 50 ppm 2018
Hexamethylene Glycol 629-11-8 AIHA 10 mg/m3   2011
Hexanediamine, 1,6- 124-09-4 AIHA 1 ppm   2004
Hexanediol Diacrylate 13048-33-4 AIHA 1 mg/m3 (DSEN)   1998
Hexyl Alcohol, n- 111-27-3 AIHA 40 ppm (eye irritation)   2011
HFE-7100 163702-07-6,
163702-08-7
AIHA 750 ppm   1999
Hydroxybenzoic Acid, 4- 99-96-7 OARS 5 mg/m3   2016
Isobutyraldehyde 78-84-2 AIHA 25 ppm 2002
Isocyanuric Acid 108-80-5 AIHA 10 mg/m3 (total);
5 mg/m3 (respirable)
  2005
Isophthalic Acid 121-91-5 AIHA 10 mg/m3 (total);
5 mg/m3 (respirable)
  1991
Isoprene 78-79-5 AIHA 2 ppm   2004
Limonene, d- 5989-27-5 AIHA 30 ppm   1993
Lithium Hydroxide 1310-65-2 AIHA   1 mg/m3 (ceiling) 1999
Lithium Oxide 12057-24-8 AIHA   1 mg/m3 (ceiling) 1999
Mancozeb 8018-01-7 AIHA 1 mg/m3 (total, DSEN)   2008
Melamine 108-78-1 OARS 3 mg/m3   2016
Menthol 1490-04-6 OARS 1 ppm 3 ppm (15 min) 2014
Mercaptobenzothiazole, 2- 149-30-4 AIHA 5 mg/m3 (skin, DSEN)   2010
Mercaptoethanol 60-24-2 AIHA 0.2 ppm (skin)   2002
Methoxypropylamine, 3- 5332-73-0 AIHA 5 ppm 15 ppm (15 min) 2009
Methoxytridecafluoroheptene isomers (MPHE) Variable OARS 200 ppm 2020
Methyl Ethyl Ketoxime 96-29-7 AIHA 10 ppm (DSEN)   1990
Methyl-2-PyrroIidone, n- (NMP) 872-50-4 OARS 15 ppm (60 mg/m3) Skin 30 ppm (120 mg/m3) 2021
Methyltrichlorosilane 75-79-6 AIHA   1 ppm (ceiling) 2001
Monochloroacetic Acid 79-11-8 AIHA 0.5 ppm (skin)   2004
Nitro-1,2,4-TriazoI-5-One, 3- (NTO) 932-64-9 OARS 2 mg/m3   2014
Nitroguanidine, 1- (NQ) 556-88-7 OARS 7 mg/m3 2016
Octamethylcyclotetrasiloxane (D4) 556-67-2 OARS 10 ppm   2014
Octanol, 1- 111-87-5 AIHA 50 ppm   2005
Octene, 1- 111-66-0 AIHA 75 ppm   2000
Pentaerythritol Triacrylate 3524-68-3 AIHA 1 mg/m3 (DSEN) 1999
Pentafluoroethane, 1,1,1,2,2- 354-33-6 AIHA 1000 ppm   2009
Pentafluoropropane, 1,1,1,3,3- 460-73-1 AIHA 300 ppm   2001
Phosphono-1,2,4 butanetricarboxylic, 2-acid 37971-36-1 AIHA 10 mg/m3   2006
Picolines 109-06-8, 108-
99-6, 108-89-4
AIHA 2 ppm (skin) 5 ppm (15-min,
skin)
1988
Piperidine 110-89-4 AIHA 1 ppm (skin) 1996
Polyethylene Glycols (MW > 200) 25322-68-3 AIHA 10 mg/m3 2009
Polypropylene Glycols 25322-69-4 AIHA 10 mg/m3   1997
Potassium Bromate 7758-01-2 AIHA 0.1 mg/m3   2004
Propargyl Bromide 106-96-7 AIHA 0.1 ppm (skin) 1997
Propenoic Acid, isooctyl ester, 2- 29590-42-9 AIHA 5 ppm   2010
Propionaldehyde 123-38-6 AIHA 20 ppm   2002
Propylene Glycol 57-55-6 AIHA 10 mg/m3   2004
Propylene Glycol Monomethyl Ether Acetate 108-65-6 AIHA 50 ppm 2005
Quinoline 91-22-5 AIHA 0.001 ppm (skin)   2006
Sodium Chloroacetate 3926-62-3 OARS 0.5 ppm (2.5 mg/m3 )   2016
Sodium Hypochlorite 7681-52-9 AIHA   2 mg/m3 (15 min) 2010
Tetrachloropyridine, 2,3,5,6- 2402-79-1 OARS 5 mg/m3   2016
Tetrachlorosilane 10026-04-7 AIHA   1 ppm (ceiling) 1999
Tetraethylene Glycol Diacrylate 17831-71-9 AIHA 1 mg/m3 (skin, DSEN)   1981
TetraethylenePentamine 112-57-2 AIHA 5 mg/m3 (skin, DSEN) 2004
Tetrafluoroethane, 1,1,1,2- (HFC-134a) 811-97-2 AIHA 1000 ppm   2003
Tetrafluoroethane, 1,1,2,2- (HFC-134) 359-35-3 OARS 1000 ppm   2018
Tetrafluoroethane, 2-ChIoro-1,1,1,2- 2837-89-0 AIHA 1000 ppm 2005
Tetrafluoropropene, (Z)-1-ChIoro-2,3,3,3-
(HCFO-1224yd(Z))
111512-60-8 OARS 1000 ppm 2017
Tetrafluoropropene, 2,3,3,3,- (HFO-1234yf) 754-12-1 AIHA 500 ppm   2009
Tetrafluoropropylene, 1,3,3,3- 1645-83-6 AIHA 800 ppm 2011
Tetrahydrofurfuryl Alcohol 97-99-4 AIHA 0.5 ppm (skin)   1993
Titanium Tetrachloride 7550-45-0 AIHA 0.5 mg/m3   2009
Toluene Diamine, 2,4- and mixed isomers 95-80-7; 25376-
45-8
AIHA 0.005 ppm (skin)   2010
Toluenesulfonyl Chloride, para- 98-59-9 AIHA   5 mg/m3 (ceiling) 2009
trans-1-Chloro-3,3,3-trifluoropropylene    (HCFO
1233zd(E))
102687-65-0 OARS 800 ppm   2013
Trichlorosilane 10025-78-2 AIHA   0.5 ppm (ceiling) 1998
Triethoxysilane 998-30-1 AIHA 0.05 ppm   2000
Triethylene Glycol Diacrylate 1680-21-3 AIHA 1 mg/m3 (skin)   1981
Triethylenetetramine 112-24-3 OARS 1 ppm (skin)   2023
Triethylphosphate 78-40-0 AIHA 7.45 mg/m3   2010
TrifIuoro-2,2-Dichloroethane, 1,1,1- 306-83-2 AIHA 50 ppm   2001
Trifluoroethane, 1,1,1- 420-46-2 AIHA 1000 ppm   1996
Trifluoroethanol, 2,2,2- 75-89-8 OARS 0.3 ppm   2016
Trifluoroiodomethane (CF3I) 2314-97-8 OARS 500 ppm 1500 ppm 2018
Trimethoxysilane 2487-90-3 AIHA 0.05 ppm   2010
Trimethylamine 75-50-3 AIHA 1 ppm   2005
Trimethylchlorosilane 75-77-4 AIHA   5 ppm (ceiling) 2001
Trimethylolpropane Triacrylate 15625-89-5 AIHA 1 mg/m3 (skin)   1981
Trimethylolpropane Trimethacrylate 3290-92-4 AIHA 1 mg/m3 (skin)   1981
Trisodium Phosphate 7601-54-9 AIHA   5 mg/m3 (15 min) 2009
Urea 57-13-6 AIHA 10 mg/m3   2007
Vanillin 121-33-5 AIHA 10 mg/m3   2009
Vinylcyclohexene 100-40-3 AIHA 1 ppm   2009
Vinyltrichlorosilane 75-94-5 AIHA 1 ppm (ceiling) 2002

 


*Value withdrawn

Substances Considered But Determined to Have an Inadequate Minimum Data Set:

Chlorine Monoxide
Methylene Butanedioic Acid 
1,3-Pentadiene

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Contact us


Got a question, comment, or want more information? Please drop us a note. or email Dr. Patricia McGinnis at: mcginnis@tera.org