OSHA Compliance
Cadmium Exposure: A Respiratory Protection Guide for Employers
Kevin Rittger, MD, FACEP, Founder and Medical DirectorUpdated 
OSHA's cadmium standard sets a Permissible Exposure Limit of 5 micrograms per cubic meter of air as an 8-hour TWA. Cadmium is a known carcinogen and kidney toxin. Industries with frequent exposure include battery manufacturing, metal plating, welding, smelting, and pigment and ceramics manufacturing. Employers must assess exposure, implement controls, and provide respiratory protection under 29 CFR 1910.1027 (general industry) and 29 CFR 1926.1127 (construction).
Key Requirement. The OSHA cadmium PEL is 5 ug/m3 as an 8-hour TWA. When engineering controls cannot achieve the PEL, employers must provide respirators under 29 CFR 1910.134 and offer medical surveillance to exposed workers. Reference: 29 CFR 1910.1027 and 29 CFR 1926.1127.
Key Takeaways
- The cadmium PEL is 5 ug/m3 (8-hour TWA). The Action Level is 2.5 ug/m3.
- Cadmium is a Group 1 human carcinogen (IARC) and a known kidney toxin.
- Battery manufacturing, metal plating, welding, smelting, and pigment manufacturing are the highest-exposure industries.
- Engineering controls (LEV, enclosure, substitution) come first. Respirators are last-resort.
- Every respirator user must be medically cleared by a PLHCP under 29 CFR 1910.134(e) before fit testing.
What is cadmium?
Cadmium is a naturally occurring heavy metal found in ores alongside zinc, lead, and copper. It is used in batteries, metal coatings, pigments, and plastic stabilizers, and in the production of solar cells. Cadmium is toxic by inhalation, ingestion, and skin contact, and is classified as a Group 1 human carcinogen by IARC.
Health effects
Acute exposure
- Respiratory irritation: coughing, chest tightness, difficulty breathing
- Gastrointestinal irritation: nausea and vomiting
- Kidney effects: decreased urine output, fluid retention, electrolyte imbalance
- Neurological effects: dizziness, headache, confusion
Chronic exposure
- Kidney damage including chronic kidney disease and potential kidney failure
- Cancer including lung, prostate, and kidney cancer
- Respiratory disease including bronchitis and emphysema
- Bone disorders including osteoporosis and osteomalacia
- Gastrointestinal disorders
Who is exposed?
Routes of exposure include inhalation of fumes and dust, ingestion, and skin contact. Industries with frequent occupational exposure:
- Battery manufacturing (nickel-cadmium batteries, recycling)
- Metal plating and coating (automotive, aerospace, electronics)
- Welding and soldering when cadmium-containing materials or alloys are present
- Mining and smelting of zinc, lead, and copper ores
- Pigments, ceramics, and plastics manufacturing
OSHA regulations for cadmium
| Requirement | What it means |
|---|---|
| PEL | 5 ug/m3 as an 8-hour TWA |
| Action Level | 2.5 ug/m3 as an 8-hour TWA |
| Exposure assessment | Required initially and periodically |
| Engineering controls | Required where feasible |
| Respiratory protection | Required when controls cannot achieve the PEL |
| Medical surveillance | Required at or above the Action Level for 30+ days per year |
| Hygiene | Change rooms, showers, and lunchroom facilities for high-exposure workers |
How to control cadmium exposure
Substitution
Replace cadmium with less toxic alternatives where feasible. Example: a paint manufacturer replaces cadmium pigments with organic and inorganic alternatives that match prior color performance.
Engineering controls
- Local exhaust ventilation (LEV) captures fumes, mists, or dust at the source
- Dust collection systems with HEPA filters prevent re-suspension into the breathing zone
- Enclosure and isolation with physical barriers or containment systems
- Wet methods where appropriate
Administrative controls
Training on SOPs, restricted access to high-exposure areas, and rotation strategies where appropriate.
Personal Protective Equipment
PPE including respiratory protection, eye protection, and skin protection is required where engineering controls cannot reduce exposure to the PEL.
Respiratory protection for cadmium
Respirator selection depends on the measured exposure and the form of cadmium (dust or fume). Options include air-purifying respirators with appropriate particulate filters and supplied-air respirators for higher exposures. Selection must follow 29 CFR 1910.134(d) and a written hazard assessment.
Every respirator user must be medically cleared by a PLHCP under 29 CFR 1910.134(e) before fit testing.
Implementation Best Practices
| Step | What to do |
|---|---|
| 1. Assign a program administrator | Owns cadmium compliance with documented authority |
| 2. Conduct exposure assessment | Air monitoring on representative workers |
| 3. Implement engineering controls first | Substitution, LEV, dust collection, enclosure |
| 4. Provide hygiene facilities | Change rooms, showers, lunchroom for high-exposure work |
| 5. Clear and fit-test every respirator user | PLHCP clearance under 1910.134(e), then fit test |
| 6. Run medical surveillance | At or above Action Level for 30+ days per year |
| 7. Train annually and document it | Hazards, controls, respirator use |
| 8. Keep records | Exposure data, medical surveillance, training, fit tests |
Conclusion
Cadmium compliance follows the same logical hierarchy as silica and benzene: assess exposure, engineer it out where feasible, control with work practices, and protect with respirators only when needed. The respirator program requires PLHCP medical clearance for every wearer under 29 CFR 1910.134(e). VestMed provides that clearance through 100% online digital MEQs reviewed by our PLHCPs, with audit-ready records.
Frequently Asked Questions
Q: What is the OSHA PEL for cadmium?
A: The Permissible Exposure Limit is 5 micrograms per cubic meter of air (5 ug/m3) as an 8-hour time-weighted average. The Action Level is 2.5 ug/m3. Reference: 29 CFR 1910.1027(c) and 29 CFR 1926.1127(c).
Q: Who must be enrolled in cadmium medical surveillance?
A: Workers exposed at or above the Action Level of 2.5 ug/m3 for 30 or more days per year. Surveillance includes a medical and work history, physical exam, blood and urine biomonitoring for cadmium, and standardized respiratory questionnaire.
Q: What industries have the highest cadmium exposure?
A: Battery manufacturing (especially nickel-cadmium), metal plating and coating in automotive and aerospace, welding and soldering on cadmium-containing alloys, mining and smelting of zinc and lead ores, and pigment and ceramics manufacturing.
Q: What respirator is required for cadmium?
A: Selection depends on the form (dust or fume) and the measured exposure. Air-purifying respirators with appropriate particulate filters are common at moderate exposures. Supplied-air or PAPR respirators are required for higher exposures. Selection must follow 29 CFR 1910.134(d) and a written hazard assessment.
Q: Do workers need medical clearance to wear a respirator for cadmium work?
A: Yes. 29 CFR 1910.134(e) requires PLHCP medical clearance for every employee who wears a respirator, before fit testing or use. VestMed provides 100% online digital MEQs reviewed by PLHCPs.
Sources
- 29 CFR 1910.1027 - Cadmium (General Industry)
- 29 CFR 1926.1127 - Cadmium (Construction)
- OSHA Cadmium Topic Page
- IARC Monograph on Cadmium
The information on this page is meant to be informative and is not a substitute for professional or legal advice.
Ready to streamline respirator clearance for your workforce?
VestMed delivers 100% online digital respirator clearance, reviewed by our PLHCPs and audit-ready under 29 CFR 1910.134. No monthly fees. Pay only for clearances completed.
Get Started or call 844-837-8767 to speak with a VestMed representative.
Related reading
- OSHA Compliance
How to Conduct a Respiratory Hazard Assessment
Step-by-step guide to evaluating workplace respiratory hazards: identify exposures, conduct air sampling, document the assessment, and select respirators.
- OSHA Compliance
Respiratory Protection in Battery Manufacturing
OSHA respiratory protection for battery manufacturing: hazards by chemistry (lead-acid, Li-ion, Ni-Cd, NiMH), controls, and respirator selection.
- OSHA Compliance
Hexavalent Chromium: A Respiratory Protection Guide for Employers
OSHA hexavalent chromium standard (29 CFR 1910.1026) for welding, plating, and painting: PEL, action level, controls, respirator selection, and PLHCP clearance.
Kevin Rittger
MD, FACEP, Founder and Medical Director