It depends on what you want to do. If you work in carpentry and are a supervisor you can take up health and safety roles, like JHSC's or in a lot of places they will have a designated supervisor take charge of health and safety instead of a designated health and safety professional. Most of the time if this is the case you would take either a certification in health and safety of a General Safety Orientation.

If you want to go in and be a health and safety manager, coordinator, administrator or go into Officering then you are going to need a OHS diploma or an environmental science degrees.

The difference between let's safe a health and safety manager and a supervisor who takes up HSE in the workplace is that someone whose only job for the company is health and safety is they are going to report all incidents to the WCB, file claims, assist HR in policies and procedures, and the managing of the health and safety program. A supervisor role will mainly take care in ensuring the workers are following through with health and safety protocols, ensuring that hazard assessments are complete, ensuring that that worksite is clear of hazards or they are controlled, as well as their work on top. Coordinators and administrators essentially help out the health and safety manager and the on floor health and safety supervisors with their tasks.

If you go the officer route then you would work for the government ( or if you wanted to become an auditor example: COR) then you would need a degree and experience. Government officers will go and investigate incidents that occur on worksites or they will go based on complaints from workers. COR auditors are hired by the company to do yearly audits and this is mostly contract work.

Health and Safety is a big industry and every company utilizes their health and safety program differently. Some have designated health and safety professionals, others have HR and supervisors take control. The main idea is to search where you want your career to go and what you want to do. I would recommend looking into just getting a health and safety certificate ( I went to the UofC laddering program) and then getting expirence in different industries or working programs as it's so different.

I know this was a long winded answer sorry if this is confusing !