# The Control of Substances Hazardous to Health Regulations 1988, Schedule 1: LIST OF SUBSTANCES ASSIGNED MAXIMUM EXPOSURE LIMITS


Reference periods
Long-term maximum exposure limit (8-hour TWA reference period)
Short-term maximum exposure limit (10-minute reference period)
ppm
ppm
Substance
Formula
mg m—3
mg m—3
* Limit relates to cyclohexane soluble material
† Vinyl chloride is also subject to an overriding annual maximum exposure limit of 3 ppm.
Acrylonitrile
CH2=CHCN
2
4
—
—
Arsenic & compounds, except arsine and lead arsenate (as As)
As
—
0.2
—
—
Buta—1, 3—diene
CH2=CHCH=CH2
10
—
—
—
2—Butoxyethanol
C4H9OCH2CH2OH
25
120
—
—
Cadmium & cadmium compounds, except cadmium oxide fume and cadmium sulphide pigments (as Cd)
Cd
—
0.05
—
—
Cadmium oxide fume (as Cd)
CdO
—
0.05
—
0.05
Cadmium sulphide pigments (respirable dust as Cd)
CdS
—
0.04
—
—
Carbon disulphide
CS2
10
30
—
—
Dichloromethane
CH2Cl2
100
350
—
—
2,2'—Dichloro—4,4'—methylene dianiline (MbOCA)
CH2(C6H3ClNH2)2
—
0.005
—
—
2—Ethoxyethanol
C2H5OCH2CH2OH
10
37
—
—
2—Ethoxyethyl acetate
C2H5OCH2CH2OOCCH3L
10
54
—
—
Ethylene dibromide
BrCH2CH2Br
1
8
—
—
Ethylene oxide
CH2CH2O
5
10
—
—
Formaldehyde
HCHO
2
2.5
2
2.5
Hydrogen cyanide
HCN
—
—
10
10
Isocyanates, all (as—NCO)
—
0.02
—
0.07
Man-made mineral fibre
—
5
—
—
1—Methoxypropan—2—ol
CH3OCH2CHOHCH3
100
360
—
—
2—Methoxyethanol
CH3OCH2CH2OH
5
16
—
—
2—Methoxyethyl acetate
CH3COOCH2CH2OCH3
5
24
—
—
Rubber Process Dust
—
8
—
—
Rubber Fume
—
0.75
—
—
Styrene
C6H5CH=CH2
100
420
250
1050
1,1,1—Trichloroethane
CH3CCl3
350
1900
450
2450
Trichloroethylene
CCl2=CHCl
100
535
150
802
Vinyl chloride
CH2=CHCl
7
—
—
—
Vinylidene chloride
CH2=CCl2
10
40
—
—
Wood dust (hard wood)
—
5
—
—

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Source: https://www.legislation.gov.uk/uksi/1988/1657/schedule/1 (the official version)
Page: https://openlegislation.uk/control-of-substances-hazardous-to-health-regulations-1988/schedule-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.