| The Occupational Health and Safety Act of | | | | as Acrylonitrile, Arsenic, Asbestos, Asbestos - |
| Ontario, for instance, states that asbestos is | | | | Construction, Building and Repair, Benzene, Coke |
| classified as a designated substance in some | | | | Oven Emissions, Ethylene Oxide, Isocyanates, |
| workplaces. Hence employers are obliged to | | | | Lead, Mercury, Silica and Vinyl Chloride among |
| provide safety measures when they use a | | | | others. |
| designated substance like asbestos. | | | | The Occupational Health and Safety Act |
| The employer can only keep the amount of | | | | mentioned states that the employer has to |
| asbestos dust low, in order to reduce the | | | | review the work methods and assess the |
| possibilities of its workers of getting ill due to | | | | likelihood of worker exposure, when a designated |
| asbestos fibers inhalation or swallowing. | | | | substance such as asbestos is present in the |
| Designated Substances are hazardous substances | | | | workplace. |
| that can be a biological, chemical or physical agent | | | | The control program, when there are risk of |
| or combination thereof prescribed as a designated | | | | worker exposure to hazardous minerals like |
| substance to which the exposure of a worker is | | | | asbestos that can produce asbestosis or another |
| prohibited, regulated, restricted, limited or | | | | asbestos-related diseases, must include |
| controlled. Some regulations specify different | | | | engineering controls, work practices, hygiene |
| procedures to control designated substances such | | | | practices, record keeping and medical surveillance. |