Who is responsible for OH&S generally within any workplace, and specifically within your workplace?

In a particular workplace, it is the job of both the workers and managers to make sure that the workplace and the other employees are safe. Everyone has to be trained to make sure that they do the right things every time and in an emergency case. All the hazards should be reported to who can fix it (probably managers) as soon as they find it. Everyone is not allowed to fix anything which they have not been trained before, otherwise they can make it worse, unsafe for the other employees.