Office Of Environmental Health & Safety

Northeastern University
360 Huntington Avenue
229 Forsyth Building
Boston, MA 02115-5000

phone: 617.373.2769
fax: 617.373.7622

ehs@neu.edu Image 2

Exposure Limits and Odor Thresholds Table

CHEMICAL
PEL
(ppm)
TLV
(ppm)
STEL
(ppm)
Odor Threshold
(ppm)
IDLH
(ppm)
ACETIC ACID
10
10
15
2
1,000
ACETONE
1000
500
750
2-100
20,000
ACETONITRILE
40
2
-
20
4,000
BENZENE
1
0.5
2.5
30
2,000
N BUTYL ALCOHOL
100
50
50
0.1-3
8,000
CARBON TETRACHLORIDE
10
5
10
75
300
CHLOROFORM
50c
10c
-
100
1,000
DIETHYL AMINE
25
5
15
0.02-25
2,000
FORMALDEHYDE
0.75
 -
0.3
1
30
HEXANE
500
50
-
-
5,000
METHYL ALCOHOL
200
200
250
10
25,000
PHOSGENE
0.1
0.1
-
0.5
2
PYRIDINE
5
5
-
0.01
3,600
TOLUENE
200
50
-
0.2
2,000
TRIETHYLAMINE
25
5
15
1
1,000
XYLENE
100
100
150
0.5
10,000

PEL: Permissible Exposure Limit, OSHA Standard 29 CFR 1910.1000, Tables Z-1, Z-2, or Z-3
TWA-TLV: Time Weighted Average-Threshold Limit Values, 1999-2000 ACGIH
TWA-STEL: Time Weighted Average-Short Term Exposure Limit, 1999-2000 ACGIH
IDLH: Immediately Dangerous to Life or Health, NIOSH-MSHA
PPM: Parts of Chemical Per Million Parts of Air
C: Maximum Allowable Exposure