SCHEDULE 1 SCHEDULE TO BE SUBSTITUTED AS SCHEDULE 1 TO THE PRINCIPAL REGULATIONS
Regulation 2(2)

SCHEDULE 1 LIST OF SUBSTANCES ASSIGNED MAXIMUM EXPOSURE LIMITS
Regulations 2(1), 7(4) and 12(2)
The maximum exposure limits of the dusts included in the list below refer to the toinhalable dust fraction, unless otherwise stated.
Substance	Formula	Reference periods			
		Long-term maximum exposure limit (8-hour TWA reference period)		Short-term maximum exposure limit (10-minute reference period)	
		ppm	mg m−3	ppm	mg m−3
Acrylamide	CH2=CHCONH2	—	0.3	—	—
Acrylonitrile	CH2=CHCN	2	4	—	—
Arsenic and compounds except arsine (as As)	As	—	0.1	—	—
Benzene	C6H6	75	15	—	—
Buta-1,3-diene	CH2=CHCH=CH2	10	22	—	—
2-Butoxyethanol	C4H9OCH2CH2OH	25	120	—	—
Cadmium and 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	—	—
Chromium (VI) compounds (as Cr)	Cr	—	0.05	—	—
1,2–Dibromoethane (Ethylene dibromide)	BrCH2CH2Br	0.5	4	—	—
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	C2H5OCH2CH2OOCCH3	10	54	—	—
Ethylene oxide	CH2CH2O	5	10	—	—
Formaldehyde	HCHO	2	2.5	2	2.5
Grain dust		—	10	—	—
Hydrogen cyanide	HCN	—	—	10	10
Isocyanate, all (as-NCO)		—	0.02	—	0.07
Man-made mineral fibre		—	5	—	—
2-Methoxyethanol	CH3OCH2CH2OH	5	16	—	—
2-Methoxyethyl acetate	CH3COOCH2CH2OCH3	5	24	—	—
Nickel and its inorganic compounds (except nickel carbonyl):	Ni	—	—	—	—
water-soluble nickel compounds (as Ni)		—	0.1	—	—
nickel and water-insoluble nickel compounds (as Ni)		—	0.5	—	—
Rubber process dust		—	8	—	—
Rubber fume		—	0.6	—	—
Silica, respirable crystalline	SiO2	—	0.4	—	—
Styrene	C6H5CH=CH2	100	420	250	1,050
1,1,1-Trichlorotehane	CH3CCl3	350	1,900	450	2,450
Trichloroethylene	CCl2=CHCl	100	535	150	802
Vinyl chloride	CH2=CHCl	7	—	—	—
Vinylidene chloride	CH2=CCl2	10	40	—	—
Wood dust (hard wood)		—	5	—	—
* In addition to the maximum exposure limit specified above man-made mineral fibre is also subject to a maximum exposure limit of 2 fibres ml1, 8-hour TWA, when measured or calculated by a method approved by the Health and Safety Commission.					
† Limit relates to cyclohexane soluble material.					
‡ In addition to the maximum exposure limit specified above vinyl chloride is also subject to an overriding annual exposure limit of 3 ppm.					