General Industry (29 CFR 1910)

Benzene

Verified vs OSHA sources · 2026-10-05

29 CFR 1910.1028

29 CFR 1910.1028 protects general-industry workers from benzene, a carcinogen that causes leukemia, with three limits: a 1 ppm 8-hour TWA, a 5 ppm 15-minute STEL, and a 0.5 ppm action level. Medical surveillance built around the complete blood count is required above the action level.

29 CFR 1910.1028 at a glance

PEL: 1 ppm as an 8-hour TWA (29 CFR 1910.1028(c)(1))
STEL: 5 ppm over any 15-minute period (1910.1028(c)(2))
Action level: 0.5 ppm (8-hr TWA): triggers monitoring and medical surveillance
Health effect: Benzene is a leukemia-causing carcinogen that damages the blood-forming system
Max penalty (2026): $16,550 per serious violation; $165,514 per willful
The #1 confusion: The STEL is a hard 15-minute cap, separate from the 8-hour average: you can bust it while the TWA looks fine

What 29 CFR 1910.1028 requires (plain English)

29 CFR 1910.1028 protects general-industry workers from benzene, a volatile solvent and a confirmed human carcinogen that causes leukemia and other blood disorders by damaging the bone marrow. The standard sets three limits: a permissible exposure limit of 1 part per million as an 8-hour time-weighted average, a short-term exposure limit (STEL) of 5 ppm over any 15 minutes, and an action level of 0.5 ppm.

Benzene is found in petroleum refining, chemical manufacturing, coke and coal-chemical operations, and some laboratory and printing settings. Employers must determine exposures by monitoring, control them primarily with engineering and work-practice controls, establish regulated areas where exposure exceeds either the TWA or STEL, provide respirators where controls are insufficient, and supply protective equipment where skin or eye contact with liquid benzene can occur.

Because benzene targets the blood, the medical-surveillance program centers on the complete blood count (CBC) and is triggered at the action level; it can lead to referral and, where indicated, removal from exposure. Information and training and 30-year recordkeeping (via 1910.1020) apply. The standard has specific exemptions (for example certain gasoline storage, distribution, and sale operations) so scope must be checked before applying it.

The regulatory text

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

29 CFR 1910.1028(c)(1)

Key facts about 29 CFR 1910.1028

The benzene PEL is 1 ppm as an 8-hour TWA (1910.1028(c)(1)).
A short-term exposure limit caps exposure at 5 ppm over any 15 minutes (1910.1028(c)(2)).
The action level is 0.5 ppm (8-hr TWA) and triggers monitoring and medical surveillance.
Benzene is a carcinogen that causes leukemia and damages the bone marrow and blood-forming system.
Medical surveillance is built around the complete blood count (CBC) and starts at the action level (1910.1028(i)).
Regulated areas are required where exposure exceeds the TWA or the STEL (1910.1028(e)).
Certain gasoline storage, distribution, and sale operations are exempt from the standard (1910.1028(a)(2)).

Scope: who 29 CFR 1910.1028 applies to

Regulatory framework: General Industry (29 CFR 1910)
Citation reference: 29 CFR 1910.1028
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 1910.1028

#	Employer obligation
1	Limit exposure to 1 ppm PEL (8-hr TWA)
2	STEL of 5 ppm (15-minute)
3	Monitor exposure above action level (0.5 ppm)
4	Provide medical surveillance for exposed workers
5	Establish regulated areas above PEL
6	Use engineering controls primarily

Summarized from the text of 29 CFR 1910.1028. Always read the full regulation for the binding language.

Common Benzene violations

Deficiencies OSHA cites under 29 CFR 1910.1028 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.

Monitoring only the 8-hour TWA and missing STEL exceedances during short high-exposure tasks (1910.1028(c)).
No exposure determination where benzene is present above the action level (1910.1028(e)).
Exposures above the PEL without adequate engineering controls (1910.1028(g)).
No medical surveillance (CBC-based) for workers at or above the action level (1910.1028(i)).
No regulated area where benzene exceeds the TWA or STEL (1910.1028(e)).

The STEL is a separate 15-minute ceiling: the daily average can hide it

Employers often watch only the 1 ppm 8-hour average and miss that benzene has a distinct short-term exposure limit of 5 ppm over any 15 minutes. A brief high-concentration task (sampling a tank, cleaning a line) can exceed the STEL even when the full-shift TWA is well under the PEL, and that is an independent violation. A third figure, the 0.5 ppm action level, triggers monitoring and medical surveillance before the PEL is reached. Track all three, and check the exemptions: parts of the gasoline distribution chain are carved out of 1910.1028.

What OSHA inspectors look for

A compliance officer checks monitoring for both the 8-hour TWA and the 15-minute STEL, verifies regulated areas where either is exceeded, confirms CBC-based medical surveillance above the action level, and checks whether the operation falls within a gasoline exemption. Watching only the daily average and missing STEL exceedances is a common gap.

Example: how a violation is cited

A chemical operator samples a benzene tank in a brief high-exposure task that exceeds the 5 ppm STEL, even though the shift average stays under the PEL. OSHA cites 1910.1028(c) for the STEL exceedance: an independent violation the daily average hid, with penalties from $16,550.

Illustrative example, not a specific OSHA case.

Benzene compliance checklist

Use this to evaluate your compliance with 29 CFR 1910.1028. Each item is a key requirement OSHA may verify during an inspection.

Determine benzene exposures by monitoring for both the 8-hour TWA and the 15-minute STEL.
Reduce exposure to the 1 ppm PEL and 5 ppm STEL primarily with engineering and work-practice controls.
Establish regulated areas where exposure exceeds the TWA or STEL, and limit access.
Provide medical surveillance built around the complete blood count for workers at or above the 0.5 ppm action level.
Provide respirators where controls cannot achieve the limits, and PPE for skin/eye contact with liquid benzene.
Confirm the operation is not within an exemption, train workers, and keep records for employment plus 30 years.

2026 penalties for 29 CFR 1910.1028

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)

Benzene citations follow health inspections in refining, chemical, and coke operations. Serious violations reach $16,550 and willful or repeat violations $165,514; missed STEL exceedances and absent CBC surveillance are common 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 Benzene compliance

Benzene damages the bone marrow and causes leukemia, and short high-concentration tasks can overexpose a worker even when the shift average looks acceptable. The three-tier limit structure and CBC surveillance exist to catch both the chronic dose and the acute spike before the blood damage is done.

Free compliance tools for 29 CFR 1910.1028

SDS Gap Analyzer PPE Selector Respiratory Protection Program Builder

Benzene penalties by state

Penalties and enforcement vary by state. State-Plan states may impose higher penalties and additional requirements beyond federal 29 CFR 1910.1028.

Alabama Arkansas Colorado Connecticut Delaware District of Columbia

View all 50 states + DC →

Frequently asked questions about 29 CFR 1910.1028

What are the OSHA exposure limits for benzene?

Benzene has three limits under 1910.1028(c): a permissible exposure limit of 1 ppm as an 8-hour time-weighted average, a short-term exposure limit of 5 ppm averaged over any 15-minute period, and an action level of 0.5 ppm (8-hour TWA) that triggers exposure monitoring and medical surveillance. All three must be tracked, not just the daily average.

What is the difference between the benzene PEL and STEL?

The PEL of 1 ppm is an average over the full 8-hour shift, while the STEL of 5 ppm is a ceiling for any 15-minute period. A short, intense task can exceed the STEL even when the shift average is well below the PEL, so they are separate compliance tests. Both are set in 1910.1028(c), and either can be cited on its own.

What medical surveillance does the benzene standard require?

Under 1910.1028(i), employees exposed at or above the 0.5 ppm action level must be offered medical surveillance built around a complete blood count (CBC) with differential and platelet count, because benzene damages the blood-forming system and causes leukemia. Abnormal results lead to referral to a hematologist and, where indicated, removal from benzene exposure.

Does the benzene standard apply to gasoline?

Not entirely. 1910.1028(a)(2) exempts several gasoline-related activities (such as the storage, transportation, distribution, dispensing, sale, and use of gasoline as a motor fuel) from the substance-specific benzene standard, though general hazard-communication and other requirements still apply. Operations that manufacture benzene or use it as a chemical, however, are fully covered. Always confirm scope before deciding the standard does not apply.

Regulatory history of 29 CFR 1910.1028

OSHA issued the current benzene standard in 1987 (52 FR 34460), lowering the PEL from 10 ppm to 1 ppm and adding a 5 ppm STEL and medical surveillance, after the Supreme Court's 1980 Industrial Union Department v. American Petroleum Institute (the 'Benzene' decision) required OSHA to show a significant risk before tightening a limit, which OSHA then documented for leukemia.

Related glossary terms

Key terms that appear in 29 CFR 1910.1028, each with a full plain-English explainer.

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

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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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