Hazardous Materials

Working with hazardous materials can be dangerous and pose a threat to workers, the public, and the environment. In Ontario, the Occupational Health and Safety Act (OHSA) sets out the rules and regulations for managing hazardous materials in the workplace.

Examples of hazardous materials include chemicals, biological agents, and radioactive materials.

Hazardous materials, also known as hazardous substances, are substances that are dangerous or potentially harmful to human health or the environment.

What are Hazardous Materials?

​How do I know if a material is hazardous?

The OHSA requires employers to determine if a material is hazardous and to inform workers if it is. Employers must also provide workers with information about the hazardous properties of the material, as well as the measures that have been put in place to protect workers from its harmful effects.

​Hazard Symbols and Their Meanings

What are my rights and
responsibilities as a worker?

As a worker, you have the right to know about the hazardous materials you may be exposed to on the job. You also have the right to refuse work that you believe is dangerous to your health or safety. If you have any concerns about hazardous materials in your workplace, you should raise them with your supervisor or employer.

What are my rights and
responsibilities as a worker?

Under the OHSA, you also have a duty to take reasonable care to protect your own health and safety, as well as the health and safety of others who may be affected by your actions. This means that you must follow any procedures and protocols that have been put in place to manage hazardous materials in your workplace.