Regulation 2(2)
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 | ||
* 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. | |||||
| 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 | — | — | — | — |
| — | 0.1 | — | — | |
| — | 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 | — | — | |