OSHA term · Glossary
Cadmium
Verified vs OSHA sources · 2026-10-05
A soft, toxic heavy metal used in batteries (nickel-cadmium), pigments, coatings/electroplating, and some solders and alloys. Inhaling cadmium fume or dust damages the lungs and kidneys and causes cancer. OSHA regulates it under 29 CFR 1926.1127 (construction) and 1910.1027 (general industry) with a permissible exposure limit of 5 µg/m³ as an 8-hour TWA and an action level of 2.5 µg/m³.
Also known as: Cd, cadmium fume, cadmium oxide
On this page
Cadmium at a glance
- PEL: 5 µg/m³ as an 8-hour TWA (29 CFR 1926.1127(c) / 1910.1027(c)).
- Action level: 2.5 µg/m³ (8-hour TWA) — triggers monitoring and medical surveillance.
- Confirmed carcinogen (lung cancer); also causes chronic kidney disease and lung damage (emphysema).
- Acute high-dose inhalation of cadmium fume can cause chemical pneumonitis, which can be fatal.
- Biological monitoring uses cadmium in blood (CdB) and urine (CdU), plus beta-2-microglobulin as an early kidney-effect marker.
- Common sources: welding/brazing/cutting cadmium-coated or -containing metal, battery manufacturing, electroplating, and pigments.
- Medical removal protection applies when biological monitoring shows levels indicating health risk.
In plain English
A toxic metal found in some batteries, paints, and platings. Breathing its fume or dust — often from welding, brazing, or cutting cadmium-coated metal — harms the lungs and kidneys and causes cancer. OSHA limits airborne cadmium to 5 micrograms per cubic meter of air over a shift.
What the rule says
“The employer shall assure that no employee is exposed to an airborne concentration of cadmium in excess of five micrograms per cubic meter of air (5 µg/m3), calculated as an eight-hour time-weighted average exposure (TWA).”
In context
An enforcement, recordkeeping, or general-duty concept under the Occupational Safety and Health Act and 29 CFR. These terms define how OSHA inspects, cites, and penalizes employers.
Where this is written in OSHA's rules
- 29 CFR 1926.1127Read on eCFR / OSHA.gov
- 29 CFR 1910.1027Read on eCFR / OSHA.gov
- 29 CFR 1926.1127(c)Read on eCFR / OSHA.gov
Example
A maintenance worker silver-brazes with a cadmium-bearing filler in a poorly ventilated shop. Air sampling shows 3 µg/m³ cadmium as an 8-hour TWA — above the 2.5 µg/m³ action level but below the 5 µg/m³ PEL. The employer must implement monitoring, provide medical surveillance including biological monitoring (cadmium in blood and urine, plus beta-2-microglobulin for early kidney effects), and add local exhaust ventilation. Switching to a cadmium-free brazing filler where feasible eliminates the hazard at the source.
Why it matters
Cadmium is doubly dangerous: acute high-level inhalation of its fume can cause fatal chemical pneumonitis, while chronic lower-level exposure causes lung cancer and irreversible kidney disease. Welding, brazing, and cutting cadmium-coated metal can generate hazardous fume quickly, often without workers realizing the coating contains cadmium. The standard's biological monitoring — tracking cadmium in blood and urine and kidney-effect markers — catches the cumulative internal dose that air monitoring alone can miss.
Acute vs. chronic cadmium hazard
Cadmium presents two distinct dangers that are easy to overlook. Acutely, breathing a high concentration of freshly generated cadmium fume — for example, unknowingly cutting or brazing cadmium-plated metal in a confined space — can cause severe chemical pneumonitis within hours, which can be fatal and is often misdiagnosed as flu. Chronically, repeated lower-level exposure causes lung cancer and progressive, irreversible kidney damage. Because the metal is often a hidden coating rather than an obvious ingredient, workers may not know cadmium is present, making air and biological monitoring essential.
Cadmium — Limits & Health Effects
| Item | Detail |
|---|---|
| PEL (8-hr TWA) | 5 µg/m³ |
| Action level (8-hr TWA) | 2.5 µg/m³ |
| Carcinogen | Lung cancer (confirmed) |
| Chronic effect | Kidney disease; lung damage (emphysema) |
| Acute effect | Chemical pneumonitis from high fume exposure (can be fatal) |
| Biological monitoring | Cadmium in blood (CdB) & urine (CdU); beta-2-microglobulin |
Cadmium: frequently asked questions
- What is the OSHA permissible exposure limit for cadmium?
- OSHA sets the cadmium PEL at 5 µg/m³ as an 8-hour time-weighted average, with an action level of 2.5 µg/m³. The same limits apply under the construction standard (29 CFR 1926.1127) and the general industry standard (1910.1027). Exceeding the action level triggers periodic exposure monitoring and a medical surveillance program that includes biological monitoring.
- Why is cadmium fume so dangerous when welding or brazing?
- Cadmium is often present as a plating or an alloying/brazing component that isn't obvious, so workers may generate cadmium fume without realizing it. Acutely, inhaling a high concentration of fresh cadmium fume can cause chemical pneumonitis — a severe, sometimes fatal lung injury that can be mistaken for the flu. Chronically, repeated exposure causes lung cancer and irreversible kidney damage. Adequate ventilation, respiratory protection, and — where feasible — cadmium-free substitute materials are the key controls.
- How is cadmium exposure monitored medically?
- In addition to air monitoring against the PEL, the cadmium standard requires biological monitoring: measuring cadmium in blood (CdB) and in urine (CdU), and beta-2-microglobulin in urine as an early marker of kidney effects. These measures track the cumulative dose absorbed into the body and can trigger medical removal protection when they indicate a health risk, catching harm that air sampling alone might miss.
Related terms
More OSHA terms
The action an employer takes to fix a cited violation or eliminate a hazard OSHA identified during an inspection. The citation sets an abatement date, the deadline to correct the hazard, and within 10 calendar days after that date the employer must certify to OSHA that the violation was abated. Failure to abate accrues additional penalties of up to $16,550 per day.
Area DirectorThe senior OSHA official in charge of a specific OSHA Area Office — the local unit that runs inspections and enforcement in its geographic territory. The Area Director has the authority to issue citations, propose penalties, hold informal conferences with employers, and approve settlement agreements. When a Compliance Safety and Health Officer (CSHO) completes an inspection, it's the Area Director who ultimately issues the citation.
Bureau of Labor Statistics (BLS)The federal statistical agency within the U.S. Department of Labor that collects, analyzes, and publishes data on workplace injuries, illnesses, and fatalities. BLS conducts the annual Survey of Occupational Injuries and Illnesses (SOII) — compiled from employer OSHA 300 logs — and the Census of Fatal Occupational Injuries (CFOI). SOII data drives OSHA's Site-Specific Targeting (SST) program: establishments whose DART rates significantly exceed their BLS industry average are placed on the SST inspection list.
Competent PersonUnder OSHA's construction standards, a person who is capable of identifying existing and predictable hazards in the surroundings or working conditions, and who has the authorization to take prompt corrective measures to eliminate them. The role requires both knowledge and the authority to act, and is mandated by name in many specific standards — excavations, scaffolds, fall protection, asbestos, and more.
CitationThe formal written notice OSHA issues to an employer after an inspection, describing each alleged violation, the standard cited, the proposed penalty, and the date by which the hazard must be corrected (abated). OSHA must issue a citation with reasonable promptness and no later than six months after the violation occurred.
Closing ConferenceThe meeting at the end of an OSHA inspection where the compliance officer confers with the employer and informally advises them of any apparent violations found. Importantly, the closing conference discusses what was observed and the employer's rights — but it does NOT state final citations or penalties, which come later in the written Citation and Notification of Penalty.
Compliance Officer (CSHO)An OSHA Compliance Safety and Health Officer — the inspector who conducts workplace inspections. A CSHO presents credentials (a photo ID and a serial number), holds the opening conference, performs the walkaround, collects evidence, interviews employees, and recommends citations. CSHOs are either safety specialists or industrial hygienists.
ContestAn employer's formal challenge to an OSHA citation, penalty, or abatement date. To contest, the employer must file a written Notice of Contest with the OSHA Area Director within 15 working days of receiving the Citation and Notification of Penalty. Filing sends the case to the independent Occupational Safety and Health Review Commission (OSHRC); missing the deadline makes the citation a final, un-appealable order.
Sources & verification
- 29 CFR 1926.1127 (eCFR / OSHA.gov)
- 29 CFR 1910.1027 (eCFR / OSHA.gov)
- 29 CFR 1926.1127(c) (eCFR / OSHA.gov)
- OSHA — Cadmium (Safety and Health Topics)
- OSHA — 29 CFR 1910.1027 (Cadmium)
Reviewed by HazComFast against eCFR, OSHA.gov, NIOSH, and the Federal Register. Last reviewed 2026-10-05. This glossary is general information, not legal advice; OSHA State-Plan states (e.g. California, Michigan) may adopt stricter requirements.
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