Occupational health and safety (OHS) is the field dedicated to preventing injuries, illnesses, and deaths in the workplace. It covers everything from the physical hazards on a construction site to the ergonomic setup of a desk chair in a home office. In the United States alone, private industry employers reported 2.5 million nonfatal workplace injuries and illnesses in 2024, and employers pay more than $1 billion per week in direct workers’ compensation costs for disabling injuries. OHS exists to bring those numbers down through a combination of law, science, and practical workplace management.
The Legal Foundation
In the U.S., occupational health and safety is rooted in the Occupational Safety and Health Act of 1970, which created OSHA (the Occupational Safety and Health Administration) as its enforcement arm. The law’s central requirement is known as the General Duty Clause: every employer “shall furnish to each of his employees employment and a place of employment which are free from recognized hazards that are causing or are likely to cause death or serious physical harm.” That single sentence is the legal backbone of workplace safety in America. It means employers can be held responsible not just for violating specific regulations, but for allowing any known danger to persist.
Beyond the General Duty Clause, OSHA sets detailed standards for specific industries and hazards, covering topics like fall protection, chemical exposure limits, machine guarding, and electrical safety. Employers with more than 10 employees are generally required to keep formal records of workplace injuries and illnesses using OSHA’s recordkeeping forms, which helps track patterns and hold workplaces accountable. Other countries have equivalent agencies and laws, but the core principle is universal: employers bear a legal responsibility to protect the people who work for them.
What OHS Actually Covers
The “health” and “safety” in OHS address two overlapping but distinct categories of risk. Safety hazards are the acute, immediate dangers: falls, machinery accidents, electrocution, struck-by incidents. Health hazards are the slower-building threats: repeated chemical exposure, chronic noise, poor air quality, repetitive strain injuries, and work-related mental health conditions like burnout and stress disorders.
A complete OHS program touches nearly every aspect of how work gets done. That includes identifying what could go wrong, measuring the severity and likelihood of each risk, putting controls in place, training workers, investigating incidents when they happen, and continuously revising the plan based on what’s learned. It’s not a one-time checklist. It’s an ongoing cycle of assessment and improvement.
The Hierarchy of Controls
When a hazard is identified, safety professionals don’t just hand workers a pair of gloves and call it solved. They follow a ranking system called the hierarchy of controls, which prioritizes solutions from most to least effective. The goal is always to start at the top and only move down when higher-level controls aren’t feasible.
- Elimination: Remove the hazard entirely. Stop using the dangerous chemical. Do the work at ground level instead of at height. If the hazard doesn’t exist, no one can be hurt by it.
- Substitution: Replace something dangerous with something less dangerous. Switch to a less toxic solvent, or use a process that requires less force, heat, or electrical current.
- Engineering controls: Put a physical barrier between the worker and the hazard. This includes machine guards, ventilation systems that pull contaminated air away from workers, noise enclosures around loud equipment, and guardrails on elevated platforms.
- Administrative controls: Change how or when work is done. Rotate workers through high-exposure tasks so no one person absorbs too much risk. Create written safety procedures, conduct regular training, post warning signs, and schedule preventive maintenance on equipment.
- Personal protective equipment (PPE): Safety glasses, respirators, hard hats, hearing protection, harnesses. PPE is the last line of defense, not the first, because it depends entirely on the worker using it correctly every single time. It’s often used alongside higher-level controls rather than as a standalone solution.
The reason this hierarchy matters is practical. A ventilation system that removes toxic fumes protects every worker in the area automatically. A respirator only works if it fits properly, if the filters are current, and if the worker actually wears it. The further up the hierarchy you go, the less you depend on human behavior to keep people safe.
How OHS Is Managed in Organizations
Larger organizations often build formal management systems around occupational health and safety. The international benchmark for this is ISO 45001, a standard that lays out requirements for an OHS management system. It calls for leadership commitment, active worker participation, systematic hazard identification and risk assessment, legal compliance, emergency planning, incident investigation, and continual improvement. The framework follows a Plan-Do-Check-Act cycle: design the system, implement it, monitor whether it’s working, and adjust based on results.
You don’t need ISO certification to run a safe workplace, but the standard reflects what effective OHS looks like at scale. Smaller businesses typically follow the same principles in simpler form: identify your hazards, put controls in place, train your people, keep records, and learn from incidents. The size of the paperwork changes, but the logic stays the same.
The Cost of Getting It Wrong
Workplace injuries carry enormous financial weight. Liberty Mutual’s 2025 Workplace Safety Index estimated that employers pay more than $1 billion every week in direct workers’ compensation costs for disabling, nonfatal injuries. That figure only covers direct costs like medical bills and wage replacement. It doesn’t account for indirect costs: lost productivity, hiring and training replacement workers, equipment damage, regulatory fines, and increased insurance premiums. Indirect costs typically multiply the direct costs by a factor of two to five, depending on the industry and the severity of the incident.
The 2024 nonfatal injury and illness rate in private industry was 2.3 cases per 100 full-time workers, down slightly from 2.4 the year before. That steady decline over recent decades reflects real progress, driven by stronger regulations, better technology, and broader adoption of safety management practices. But 2.5 million injuries in a single year is still a staggering number, and certain industries like construction, manufacturing, agriculture, and healthcare continue to carry disproportionate risk.
OHS for Remote and Hybrid Workers
The shift toward remote and hybrid work hasn’t eliminated employer safety responsibilities. It has changed their shape. When someone works from home, the key hazards shift toward ergonomics and electrical safety. A poorly set up home workstation can cause chronic neck, back, and wrist problems over time, and improperly maintained power cords or overloaded outlets present fire and shock risks.
Many employers now conduct home workstation assessments, either in person or through virtual checklists, covering desk height, monitor positioning, chair support, and electrical cord safety. Some provide ergonomic equipment like adjustable chairs, external monitors, keyboards, and footrests. Training on proper desk setup is a common component of onboarding for remote roles. The principle is the same as in any workplace: identify the hazards that exist where the work happens, and take reasonable steps to control them.
Who Works in OHS
Occupational health and safety is both a regulatory framework and a professional field. Safety professionals include industrial hygienists who measure chemical and noise exposures, safety engineers who design safer equipment and processes, ergonomists who optimize how people interact with their workstations, and occupational health nurses and physicians who manage work-related medical issues. Many hold certifications like the Certified Safety Professional (CSP) or Certified Industrial Hygienist (CIH).
But OHS isn’t solely the domain of specialists. In effective workplaces, safety is embedded into daily operations. Supervisors conduct toolbox talks before shifts. Workers report near-misses without fear of retaliation. Maintenance teams follow lockout procedures before servicing equipment. The organizations with the strongest safety records treat OHS not as a department, but as a shared responsibility that runs through every role and every task.