Occupational safety and health is an area concerned with protecting the safety, health and welfare of people engaged in work or employment. The goals of occupational safety and health programs include to foster a safe and healthy work environment.[1]
OSH may also protect co-workers, family members, employers, customers, and many others who might be affected by the workplace environment.
Occupational safety and health can be important for moral, legal, and financial reasons. All organisations have a duty of care to ensure that employees and any other person who may be affected by the companies
undertaking remain safe at all times.

Source: http://en.wikipedia.org/wiki/Occupational_safety_and_health