Occupational and environmental health nursing protects and promotes the health and safety of workers and the communities around workplaces. The occupational health nurse (OHN) works in industry, health care, government, and service settings; the national professional organization is the American Association of Occupational Health Nurses (AAOHN), and specialty certification is available (COHN). NIOSH's Total Worker Health approach joins traditional safety protection with health promotion and well-being.
Workplace hazard categories
| Category | Examples | Health effects |
|---|
| Chemical | Organic solvents (painting, degreasing), lead, silica, asbestos, pesticides, anesthetic gases | Neurotoxicity, liver and kidney damage, lung disease, cancer, dermatitis |
| Physical | Noise, vibration, heat and cold, ionizing and nonionizing radiation | Noise-induced hearing loss, heat illness, hand–arm vibration syndrome |
| Biological | Bloodborne pathogens, tuberculosis, zoonoses, molds | Infection, allergy |
| Ergonomic | Repetition, awkward postures, forceful exertion, lifting, contact stress, vibration | Work-related musculoskeletal disorders (back injury, carpal tunnel syndrome) |
| Psychosocial | High demands with low control, shift work, workplace violence, bullying | Stress, sleep disorders, burnout, cardiovascular risk |
| Safety (mechanical) | Unguarded machines, falls, slippery floors, electrical hazards, vehicles | Traumatic injury, death |
Routes of exposure: inhalation (most common for workplace chemicals), skin contact, ingestion, and injection (needlesticks).
Exposure limits
| Limit | Set by | Status |
|---|
| Permissible exposure limit (PEL) | OSHA | Legally enforceable |
| Recommended exposure limit (REL) | NIOSH | Recommendation based on research |
| Threshold limit value (TLV) | ACGIH (professional organization) | Voluntary guideline |
Limits are expressed as an 8-hour time-weighted average (TWA), a short-term exposure limit (usually 15 minutes), or a ceiling that must never be exceeded.
Occupational Safety and Health Act of 1970 (OSH Act)
- Created OSHA (Department of Labor) to set and enforce standards, inspect workplaces, and issue citations, and NIOSH (in CDC) to research hazards and recommend limits
- General Duty Clause: employers must keep the workplace free from recognized serious hazards even when no specific standard exists (used, for example, for heat and workplace violence)
- States may run OSHA-approved state plans that must be at least as effective as federal OSHA
Hierarchy of controls (NIOSH), most to least effective
- Elimination — remove the hazard
- Substitution — replace with a less hazardous material or process (water-based instead of solvent-based paint)
- Engineering controls — isolate people from the hazard (local exhaust ventilation at the welding point, enclosure or automation, machine guards, noise enclosures, safety-engineered sharps)
- Administrative controls — change how work is done (training, job rotation, work–rest schedules, warning signs, procedures)
- Personal protective equipment (PPE) — respirators, gloves, hearing protectors, fall-arrest harnesses; the last line of defense because it depends on correct, consistent use
Levels of prevention at work
- Primary: hazard control, safe design, immunization (hepatitis B for health care workers), training
- Secondary: medical surveillance (audiometry, blood lead, spirometry, TB screening), early reporting of symptoms
- Tertiary: treatment, rehabilitation, modified duty, and return-to-work planning
Key OSHA requirements nurses should know
| Area | Requirement |
|---|
| Hazard Communication | Labels with signal word, pictograms, hazard and precautionary statements; safety data sheets (SDS) in a 16-section format; worker training; written program |
| Noise (29 CFR 1910.95) | PEL 90 dBA 8-hour TWA with a 5-dB exchange rate (95 dBA = 4 hours); hearing conservation program at 85 dBA TWA (action level): monitoring, free hearing protectors, baseline audiogram within 6 months, annual audiograms, annual training; a standard threshold shift is an average change of 10 dB or more at 2,000, 3,000, and 4,000 Hz in either ear, and the worker is told in writing within 21 days. NIOSH recommends a stricter 85 dBA REL with a 3-dB exchange rate |
| Lead (general industry) | Medical removal when a blood lead level is 60 µg/dL (2.9 µmol/L) or higher (confirmed) or the average of recent tests is 50 µg/dL (2.4 µmol/L) or higher; return when two consecutive levels are 40 µg/dL (1.9 µmol/L) or lower, with wage and benefit protection (the construction standard, 29 CFR 1926.62, removes at 50 µg/dL or higher) |
| Bloodborne Pathogens | Exposure control plan, engineering controls and safer sharps (Needlestick Safety and Prevention Act, 2000), hepatitis B vaccine offered at no cost, post-exposure evaluation |
| Recordkeeping | Log work-related injuries and illnesses on Forms 300, 300A, 301; keep them 5 years; post the 300A summary February 1 to April 30 |
| Severe injury reporting | Report a work-related fatality within 8 hours; an in-patient hospitalization, amputation, or loss of an eye within 24 hours |
| Medical and exposure records (29 CFR 1910.1020) | Medical records kept for duration of employment plus 30 years; exposure records 30 years; workers have the right to access them |
Heat: as of 2026 there is no final federal OSHA heat standard; a proposed rule (2024) has not been finalized. OSHA can still cite serious heat hazards under the General Duty Clause, and several states have their own heat rules.
Workers' compensation is a state-based, no-fault insurance system: workers receive medical care, wage replacement, and rehabilitation for work-related injury or illness regardless of fault, and in exchange it is generally the exclusive remedy (workers usually cannot sue the employer). Federal employees are covered by the Federal Employees' Compensation Act (FECA).
Workplace walk-through and occupational history
- Observe processes, chemicals, ventilation, noise, housekeeping, ergonomics, and PPE use
- Ask every ill worker about job tasks, exposures, protective equipment, timing of symptoms (better on weekends?), and whether coworkers have similar symptoms
- For quantitative exposure data, rely on industrial hygiene air sampling (for noise, personal dosimetry over the full shift)
Injury and illness rates (US standard)
Incidence rate = (number of recordable cases × 200,000) ÷ total hours worked by all employees. The 200,000 represents 100 full-time workers (40 hours × 50 weeks), so the result is cases per 100 full-time workers per year.
- Example 1: 11 recordable cases; 130,000 hours worked → (11 × 200,000) ÷ 130,000 = 2,200,000 ÷ 130,000 = 16.9 per 100 full-time workers
- Example 2: 4 recordable cases; 250 employees each working 2,000 hours = 500,000 hours → (4 × 200,000) ÷ 500,000 = 1.6 per 100 full-time workers
- The same formula gives the DART rate (days away, restricted, or transferred cases): 2 DART cases in 500,000 hours → (2 × 200,000) ÷ 500,000 = 0.8
Specific worker groups
- Painters and solvent users: teach recognition of solvent symptoms (headache, dizziness, dermatitis), correct respirator and glove use; push for substitution and ventilation first
- Noise-exposed workers with tinnitus or high-frequency hearing loss: assess noise levels and hearing-protector use, review audiograms, refer, and check controls for coworkers
- Shift workers: circadian disruption causes sleep loss, fatigue, gastrointestinal problems, and errors; teach sleep hygiene (dark, quiet room; consistent sleep period; caution with caffeine late in the shift; avoid drowsy driving), plan meals; forward-rotating schedules (day → evening → night) are generally better tolerated; allow rest breaks and napping areas where policy permits
- Musculoskeletal prevention: redesign the job (adjustable workstations, lift assists, tool redesign) before relying on training or back belts
- Health care workers: safe patient handling equipment, sharps safety, workplace violence prevention programs
Environmental health links
- Take-home exposures: lead dust on clothing can poison family members; provide changing areas and showers
- Community exposures from workplace emissions or spills; coordinate with the local health department and EPA
- Indoor air quality, radon (EPA action level 4 pCi/L, 148 Bq/m³), safe drinking water, and emergency lighting and exits are part of a safe building
- Direct care and case management of work-related injuries and illnesses; return-to-work and modified duty
- Medical surveillance programs and pre-placement evaluations (under the ADA, medical examinations may be required only after a conditional job offer)
- Health promotion and screening (blood pressure, tobacco cessation, vaccination, stress management)
- Hazard recognition, worksite walk-throughs, and recommendations using the hierarchy of controls
- Training (hazard communication, PPE, bloodborne pathogens)
- Recordkeeping support and analysis of injury trends
- Emergency preparedness and first aid programs
- Advocacy for worker safety within the organization
- Confidentiality: employee medical information is kept separate from personnel files and shared with supervisors only as needed for work restrictions or accommodations (ADA); workers' compensation and OSHA rules allow limited disclosures
- Worker rights: workers may file a confidential complaint with OSHA, request an inspection, and receive training in a language they understand; employers may not retaliate — a retaliation complaint under Section 11(c) of the OSH Act must be filed within 30 days
- Dual loyalty: the OHN is paid by the employer but owes the worker honest, confidential care; worker health and safety come first
- Scope of practice: work within the state Nurse Practice Act and standing orders; do not diagnose occupational disease independently
- Documentation: objective records support workers' compensation decisions and legal proceedings
- Accommodation: the ADA and FMLA may apply to workers with serious health conditions
Case 1 — Elevated blood lead. A battery plant worker's confirmed blood lead level is 62 µg/dL (3.0 µmol/L).
Action: arrange medical removal from lead exposure (with wage protection), medical evaluation, and investigation of the source; evaluate coworkers and improve controls.
Why: stopping further exposure is the immediate priority; the OSHA general industry lead standard requires removal at 60 µg/dL (2.9 µmol/L) or higher.
Case 2 — Welding fumes. Welders report cough and metal fume fever symptoms. The supervisor proposes new masks.
Action: recommend local exhaust ventilation at the source first, with respirators under a respiratory protection program as a supplement.
Why: engineering controls rank above PPE in the hierarchy of controls.
Case 3 — Oil spill on the floor. During a walk-through, the nurse sees an oil puddle in a busy aisle and boxes stacked near a stairway.
Action: have the spill cleaned up and the area blocked immediately, then address the boxes and the source of the leak.
Why: the slippery surface is the most immediate fall hazard; removing it is the priority.
- Choosing PPE as the "best" control — it is the least effective; eliminate, substitute, or engineer first
- Confusing OSHA PEL (enforceable) with NIOSH REL (recommendation)
- Using a 1,000,000-hour base — the US incidence rate uses 200,000 hours
- Mixing noise thresholds: 85 dBA triggers the hearing conservation program; 90 dBA is the PEL
- Assuming OSHA injury logs are kept 30 years — the 300 log is 5 years; medical and exposure records are 30 years
- Thinking workers' compensation requires proving employer fault
- Forgetting take-home exposures to families
- Placing a padded mat below a work-at-height area and calling it fall prevention — guardrails and fall-arrest systems prevent falls
- OSH Act 1970: OSHA (standards, enforcement, Department of Labor) and NIOSH (research, CDC); General Duty Clause fills gaps
- Hierarchy of controls: elimination → substitution → engineering → administrative → PPE
- Noise: PEL 90 dBA (5-dB exchange); hearing conservation at 85 dBA; baseline audiogram within 6 months, then annual; STS = 10 dB average shift at 2,000–4,000 Hz
- Lead: removal at ≥ 60 µg/dL (2.9 µmol/L) or average ≥ 50 µg/dL (2.4 µmol/L); return at ≤ 40 µg/dL (1.9 µmol/L) twice
- Incidence rate = cases × 200,000 ÷ hours worked (per 100 full-time workers)
- Report fatality within 8 hours; hospitalization, amputation, eye loss within 24 hours; keep 300 logs 5 years; post 300A February 1–April 30
- Medical records: employment plus 30 years; exposure records 30 years
- SDS: 16 sections; workers have the right to know chemical hazards
- Workers' compensation: state-based, no-fault, exclusive remedy; FECA for federal workers
- No final federal heat standard yet; General Duty Clause applies