General Industry (29 CFR 1910)

1,3-Butadiene

Verified vs OSHA sources · 2026-10-05

29 CFR 1910.1051

29 CFR 1910.1051 protects general-industry workers from 1,3-butadiene (BD), a gas used to make synthetic rubber and plastics and a carcinogen linked to leukemia. It caps exposure at 1 ppm as an 8-hour TWA with a 5 ppm 15-minute STEL and a 0.5 ppm action level, requiring monitoring, controls, regulated areas, and medical surveillance.

29 CFR 1910.1051 at a glance

PEL: 1 ppm as an 8-hour TWA (29 CFR 1910.1051(c)(1))
STEL: 5 ppm over any 15-minute period (1910.1051(c)(2))
Action level: 0.5 ppm (8-hr TWA): triggers monitoring and medical surveillance
Health effect: Carcinogen linked to leukemia and other blood cancers
Max penalty (2026): $16,550 per serious violation; $165,514 per willful
The #1 confusion: BD is a leak-prone gas: fugitive emissions, not just process releases, drive exposure

What 29 CFR 1910.1051 requires (plain English)

29 CFR 1910.1051 protects general-industry workers from 1,3-butadiene (BD), a colorless gas produced from petroleum and used primarily to manufacture synthetic rubber for tires and other elastomers, and plastics such as ABS. It is a confirmed human carcinogen associated with leukemia and other cancers of the blood-forming system.

The standard sets a permissible exposure limit of 1 ppm as an 8-hour time-weighted average and a short-term exposure limit of 5 ppm over any 15 minutes, with an action level of 0.5 ppm that triggers monitoring and medical surveillance. Where exposures exceed the limits, engineering and work-practice controls (leak detection and repair, closed systems, ventilation) are the primary means of compliance, with regulated areas, respirators, and training as needed.

1910.1051 is a Subpart Z substance-specific health standard. Because butadiene is handled in large volumes in petrochemical and rubber plants where fugitive emissions from seals, valves, and sampling are common, the standard emphasizes monitoring and leak control.

The regulatory text

“The employer shall ensure that no employee is exposed to an airborne concentration of BD in excess of one (1) part BD per million parts of air (ppm) measured as an eight (8)-hour time-weighted average.”

29 CFR 1910.1051(c)(1)

Key facts about 29 CFR 1910.1051

The 1,3-butadiene PEL is 1 ppm as an 8-hour TWA (1910.1051(c)(1)).
A short-term exposure limit caps exposure at 5 ppm over any 15 minutes (1910.1051(c)(2)).
The action level is 0.5 ppm (8-hr TWA) and triggers monitoring and medical surveillance.
BD is a carcinogen linked to leukemia and other blood cancers.
It is used to make synthetic rubber (tires) and plastics such as ABS.
Fugitive emissions from seals, valves, and sampling drive much of the exposure.
Leak detection and repair and closed systems are the primary controls.

Scope: who 29 CFR 1910.1051 applies to

Regulatory framework: General Industry (29 CFR 1910)
Citation reference: 29 CFR 1910.1051
Enforcement status: In force and enforced
Jurisdiction: Federal OSHA (29 State-Plan jurisdictions may be stricter)

State-Plan states (e.g. California, Washington, Michigan) operate OSHA-approved programs that must be at least as effective as federal OSHA and frequently impose higher penalties or additional requirements. Confirm the rule as adopted in your state.

Key requirements of 29 CFR 1910.1051

#	Employer obligation
1	Limit exposure to 1 ppm PEL
2	STEL of 5 ppm (15-minute)
3	Monitor exposure above action level (0.5 ppm)
4	Provide medical surveillance including CBC
5	Establish regulated areas above PEL

Summarized from the text of 29 CFR 1910.1051. Always read the full regulation for the binding language.

Common Butadiene violations

Deficiencies OSHA cites under 29 CFR 1910.1051 include the ones below, in no particular order. Distinct deficiencies can be cited as separate items, and each serious item carries up to $16,550 (2026). Broader per-instance stacking exists but is a discretionary, case-by-case OSHA enforcement policy, not an automatic multiplier.

No exposure monitoring in butadiene production or polymer operations (1910.1051(d)).
Exposures above the PEL or STEL without adequate controls (1910.1051(f)).
No medical surveillance for workers at or above the action level (1910.1051(k)).
No regulated area where exposure exceeds the PEL or STEL (1910.1051(e)).
Fugitive leaks not detected and repaired (1910.1051(f)).

Butadiene exposure is mostly fugitive: leaks from seals and sampling, not just process upsets

A frequent misconception is that butadiene exposure only matters during process releases or upsets. In practice, most worker exposure in a butadiene or rubber plant is fugitive: a slow leak from a pump seal, a valve, a flange, or a sampling point that quietly raises the background concentration. Because BD is a carcinogen with no safe threshold, these low-level chronic exposures matter, which is why 1910.1051 requires exposure monitoring and controls to keep levels under the 1 ppm PEL and 5 ppm STEL, and why leak detection and repair is central to compliance. Watching only for big releases misses the everyday fugitive exposure.

What OSHA inspectors look for

A compliance officer checks exposure monitoring in butadiene production and polymer operations, verifies engineering controls and regulated areas where the PEL or STEL is exceeded, and confirms medical surveillance above the action level. Leaking process equipment without monitoring is the classic finding.

Example: how a violation is cited

Workers at a synthetic-rubber plant are exposed to butadiene from leaking pump seals and sampling points, with no monitoring or medical surveillance. OSHA cites 1910.1051 for the overexposure and missing surveillance, with penalties from $16,550.

Illustrative example, not a specific OSHA case.

Butadiene compliance checklist

Use this to evaluate your compliance with 29 CFR 1910.1051. Each item is a key requirement OSHA may verify during an inspection.

Monitor exposures in production, polymerization, and sampling areas.
Reduce exposure to the 1 ppm PEL and 5 ppm STEL with closed systems, ventilation, and leak detection and repair.
Provide medical surveillance for workers at or above the 0.5 ppm action level.
Establish regulated areas where exposure exceeds the limits.
Provide respirators and PPE where controls are insufficient.
Train workers on the leukemia risk and on recognizing and reporting fugitive leaks.

2026 penalties for 29 CFR 1910.1051

Maximums set by 29 CFR 1903.15(d). 2026 amounts unchanged from 2025 (no CPI adjustment; OMB M-26-11). Not an increase. The 2025 OSHA penalty levels remain in effect for 2026; OSHA made no inflation adjustment for 2026. 29 CFR 1903.15 identifies January 15, 2025 as the effective reference for these amounts, while OSHA's public penalties page currently references penalties assessed after Jan. 15, 2026.

Violation type	Minimum	Maximum	When it applies
Serious	$1,085	$16,550	Substantial probability of death or serious physical harm.
Other-Than-Serious	$0	$16,550	Relates to safety/health but unlikely to cause death or serious harm.
Willful	$11,823	$165,514	Intentional, knowing, or voluntary disregard of the requirement.
Repeated	$4,256	$165,514	A substantially similar violation cited within the last 5 years.
Failure to Abate	None	$16,550/day	up to $16,550 per day; total capped at 30x the daily amount (FOM Ch.6)

Butadiene citations follow health inspections of petrochemical and rubber operations. Serious violations reach $16,550 and willful or repeat violations $165,514; unmonitored leaks and absent surveillance are the usual findings.

Maximums and the willful minimum are set by 29 CFR 1903.15(d); the serious and repeated minimums are OSHA policy floors from its annual penalty adjustment memo. OSHA applies gravity-based and size, good-faith and history reductions (FOM CPL 02-00-164 Ch.6). Estimates only, not legal advice.

The business case for Butadiene compliance

1,3-butadiene is a carcinogen linked to leukemia and other blood cancers, and it is produced and used in enormous quantities to make synthetic rubber (tires) and plastics. Because it is a leak-prone gas, keeping exposure under the 1 ppm PEL and 5 ppm STEL with leak control and monitoring is what protects the petrochemical and rubber workforce.

Free compliance tools for 29 CFR 1910.1051

SDS Gap Analyzer Respiratory Protection Program Builder PPE Selector

Butadiene penalties by state

Penalties and enforcement vary by state. State-Plan states may impose higher penalties and additional requirements beyond federal 29 CFR 1910.1051.

Alabama Arkansas Colorado Connecticut Delaware District of Columbia

View all 50 states + DC →

Frequently asked questions about 29 CFR 1910.1051

What is the OSHA 1,3-butadiene PEL?

Under 1910.1051(c), the permissible exposure limit for 1,3-butadiene is 1 ppm as an 8-hour time-weighted average, with a short-term exposure limit of 5 ppm over any 15-minute period. An action level of 0.5 ppm (8-hour TWA) triggers exposure monitoring and medical surveillance.

Where is 1,3-butadiene used?

1,3-butadiene is produced from petroleum and used primarily to manufacture synthetic rubber for tires and other elastomers, and plastics such as ABS resin. Workers in butadiene production, styrene-butadiene rubber plants, and polymer operations are the main population exposed, largely from fugitive leaks at seals, valves, and sampling points.

Why is butadiene monitored for blood effects?

Because it is a carcinogen associated with leukemia and other cancers of the blood-forming system. Under 1910.1051(k), medical surveillance for workers at or above the action level includes a health history and physical examination with attention to the hematologic (blood) system, so early effects can be detected. The blood-cancer risk is the reason the PEL is set so low.

What is the main control for butadiene exposure?

Engineering and work-practice controls, especially leak detection and repair on the closed systems that handle butadiene. Because most exposure is fugitive (slow leaks from pump seals, valves, flanges, and sampling) finding and fixing leaks, along with ventilation and closed sampling, keeps concentrations under the 1 ppm PEL and 5 ppm STEL far more effectively than respirators alone.

Regulatory history of 29 CFR 1910.1051

OSHA issued the 1,3-butadiene standard in 1996 (61 FR 56746), lowering the PEL to 1 ppm and adding the 5 ppm STEL, monitoring, and medical surveillance after epidemiology in the synthetic-rubber industry linked butadiene to leukemia. It targets the large petrochemical and rubber-manufacturing workforce.

Related glossary terms

Key terms that appear in 29 CFR 1910.1051, each with a full plain-English explainer.

Permissible Exposure Limit (PEL)Action Level Medical Surveillance Engineering Controls Respiratory Protection Program IDLH

Related guides & articles

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Primary sources

OSHA figures on this page are imported from HazComFast's verified regulatory module (verified 2026-10-05 against eCFR, OSHA.gov, and the Federal Register).

This page is an educational summary, not legal advice. OSHA standards and penalty amounts change; confirm requirements against the current regulation and your applicable State-Plan before acting.

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