OSHA term · Glossary
Lead
Verified vs OSHA sources · 2026-10-05
A toxic heavy metal that accumulates in the body and damages the nervous system, kidneys, blood, and reproductive system. Occupational lead exposure is common in construction (demolition, renovation of painted surfaces, welding/cutting coated steel, bridge work) and in general industry (battery manufacturing, smelting, radiator repair). OSHA sets a permissible exposure limit of 50 µg/m³ as an 8-hour TWA and an action level of 30 µg/m³, under 29 CFR 1926.62 (construction) and 1910.1025 (general industry). A distinctive feature is Medical Removal Protection (MRP): workers with elevated blood lead levels must be removed from exposure with their earnings and benefits protected.
Also known as: inorganic lead, Pb, lead dust and fume
On this page
Lead at a glance
- PEL: 50 µg/m³ as an 8-hour TWA (29 CFR 1926.62(c) / 1910.1025(c)).
- Action level: 30 µg/m³ (8-hour TWA) — triggers exposure monitoring and medical surveillance.
- Medical Removal Protection (MRP) triggers at DIFFERENT levels in the two regimes, and this is the detail most summaries drop: construction removes at ≥ 50 µg/dL on a periodic and a follow-up test (1926.62(k)(1)(i)), with no averaging route; general industry removes at ≥ 60 µg/dL on a single test, or a three-test average ≥ 50 (1910.1025(k)(1)(i)).
- Return to work permitted when two consecutive tests show blood lead below 40 µg/dL.
- MRP preserves the worker's earnings, seniority, and benefits for up to 18 months during removal.
- Health effects: neurological damage, kidney disease, anemia, hypertension, and reproductive harm; lead crosses the placenta.
- Common construction sources: abrasive blasting, torch cutting/welding of coated steel, and renovation/demolition of lead-painted surfaces.
In plain English
A poisonous metal that builds up in the body over time and harms the brain, kidneys, blood, and ability to have healthy children. Workers get exposed sanding old paint, torch-cutting coated steel, or making batteries. OSHA limits airborne lead to 50 µg/m³ over a shift and, uniquely, requires that a worker whose blood lead climbs too high be pulled off the job at full pay until it drops.
What the rule says
“The employer shall assure that no employee is exposed to lead at concentrations greater than fifty micrograms per cubic meter of air (50 µg/m3) averaged over an 8-hour period.”
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 1926.62Read on eCFR / OSHA.gov
- 29 CFR 1910.1025Read on eCFR / OSHA.gov
- 29 CFR 1926.62(c)(1)Read on eCFR / OSHA.gov
Example
An ironworker torch-cutting lead-painted structural steel on a bridge is monitored and found exposed above the 30 µg/m³ action level, triggering biological monitoring. A blood test returns 62 µg/dL — at or above the 60 µg/dL threshold — so the employer must invoke Medical Removal Protection: the worker is moved to non-lead work (or removed) while keeping full earnings and benefits. The worker may return only after two consecutive blood tests read below 40 µg/dL. Meanwhile the employer must reduce airborne lead below the 50 µg/m³ PEL through engineering controls.
Why it matters
Lead poisoning is cumulative and can be permanent, and unlike most standards, the lead rule ties enforcement to the worker's actual blood level, not just air concentrations. Medical Removal Protection is one of OSHA's strongest worker protections — it removes the economic incentive to hide exposure by guaranteeing the removed worker's pay. Construction activities like abrasive blasting and torch-cutting coated steel can generate extremely high lead levels quickly, so monitoring and MRP are essential safeguards.
Air PEL vs. blood lead level
Lead is regulated on two different axes that are easy to conflate. The PEL (50 µg/m³) and action level (30 µg/m³) measure lead in the AIR the worker breathes. Medical Removal Protection, by contrast, is triggered by the lead in the worker's BLOOD (measured in µg/dL), because blood lead reflects the dose actually absorbed from all routes, including ingestion. A worker can be near the air PEL yet have a dangerous blood lead level from hand-to-mouth exposure. Both metrics matter: air controls prevent exposure, and blood monitoring catches the dose that gets through.
Lead — Air Limits vs. Medical Removal (Blood) Triggers
| Metric | Value | What It Governs |
|---|---|---|
| PEL (air) | 50 µg/m³ (8-hr TWA) | Maximum airborne lead exposure |
| Action level (air) | 30 µg/m³ (8-hr TWA) | Triggers monitoring + medical surveillance |
| MRP removal (blood) | Construction: ≥ 50 µg/dL. General industry: ≥ 60, or 3-test avg ≥ 50 | Removes worker from lead exposure, pay protected |
| MRP return (blood) | < 40 µg/dL (two consecutive tests) | Permits return to lead work |
Lead: frequently asked questions
- What is the OSHA permissible exposure limit for lead?
- OSHA sets the lead PEL at 50 µg/m³ as an 8-hour time-weighted average, with an action level of 30 µg/m³. The same air limits apply in construction (29 CFR 1926.62) and general industry (1910.1025). Exceeding the action level triggers periodic exposure monitoring and a medical surveillance program including blood lead testing.
- What is Medical Removal Protection (MRP) for lead?
- MRP requires the employer to temporarily remove a worker from lead exposure when the worker's blood lead level reaches the removal trigger. On a construction site that is 50 µg/dL, confirmed by a periodic and a follow-up test (1926.62(k)(1)(i)); in general industry it is 60 µg/dL on a single test, or a three-test average of 50 µg/dL or more under the general industry standard. Crucially, the employer must maintain the worker's earnings, seniority, and benefits during removal (up to 18 months). The worker may return only after two consecutive blood tests show a level below 40 µg/dL. MRP removes the financial pressure that might otherwise lead workers to conceal high exposures.
- Why does OSHA measure both air lead and blood lead?
- Air monitoring (against the PEL and action level) measures the lead concentration a worker breathes and drives engineering controls. Blood lead monitoring measures the dose actually absorbed into the body from all routes — inhalation and ingestion — and is what triggers Medical Removal Protection. A worker can have acceptable air exposure but elevated blood lead from hand-to-mouth transfer, so both metrics are needed to protect health.
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 1926.62 (eCFR / OSHA.gov)
- 29 CFR 1910.1025 (eCFR / OSHA.gov)
- 29 CFR 1926.62(c)(1) (eCFR / OSHA.gov)
- OSHA — Lead (Safety and Health Topics)
- OSHA — 29 CFR 1926.62 (Lead in Construction)
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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