1910.134(d)(3)(iv): OSHA rule
Key takeaways
- 1910.134(d)(3)(iv) is part of OSHA's general industry standards (29 CFR Part 1910, Subpart I).
- OSHA cited it 1 times in the last 3 years, in 1 inspections, with $0 in current penalties.
- Related part: 1910.134(d) Selection of respirators (573 citations).
- Free 5-minute toolbox talk for your crew below.
In this article
What this rule covers
29 CFR 1910.134(d)(3)(iv) is one requirement inside 1910.134 Respiratory protection, an OSHA general industry standard (Part 1910, Subpart I). It includes 3 sub-paragraphs. The official text below is copied word for word from the Electronic Code of Federal Regulations (eCFR). The numbers, injury cases and training on this page show how OSHA enforces it on real job sites.
Official text
(iv) For protection against particulates, the employer shall provide: 1 citations
(A) An atmosphere-supplying respirator; or
(B) An air-purifying respirator equipped with a filter certified by NIOSH under 30 CFR part 11 as a high efficiency particulate air (HEPA) filter, or an air-purifying respirator equipped with a filter certified for particulates by NIOSH under 42 CFR part 84; or Open (d)(3)(iv)(b)
(C) For contaminants consisting primarily of particles with mass median aerodynamic diameters (MMAD) of at least 2 micrometers, an air-purifying respirator equipped with any filter certified for particulates by NIOSH.
Table I—Assigned Protection Factors [Reserved]
| Altitude (ft.) | Oxygen deficient Atmospheres (% 02) for which the employer may rely on atmosphere-supplying respirators |
|---|---|
| Less than 3,001 | 16.0-19.5 |
| 3,001-4,000 | 16.4-19.5 |
| 4,001-5,000 | 17.1-19.5 |
| 5,001-6,000 | 17.8-19.5 |
| 6,001-7,000 | 18.5-19.5 |
| 7,001-8,000 1 | 19.3-19.5. |
| 1 Above 8,000 feet the exception does not apply. Oxygen-enriched breathing air must be supplied above 14,000 feet. | |
Source: eCFR, text current as of 2026-10-15. Read all of 1910.134.
Where and how often it was cited
Free toolbox talk
A 5-minute crew talk on 1910.134(d)(3)(iv), plus alerts when this rule changes. Free.
OSHA interpretation letters
- The use of particulate filters and respirators. (1997-05-05)
Related parts of this rule
- 1910.134(d) Selection of respirators 573 citations
- 1910.134(d)(1) General requirements 477 citations
- 1910.134(d)(1)(iii) 312 citations
- 1910.134(d)(1)(i) 88 citations
- 1910.134(d)(3) Respirators for atmospheres that are not IDLH 86 citations
- 1910.134(d)(1)(ii) 74 citations
- 1910.134(d)(3)(iii) 53 citations
- 1910.134(d)(3)(iii)(B) 52 citations
- 1910.134(d)(3)(i) 28 citations
- 1910.134(d)(3)(i)(B) Maximum Use Concentration (MUC) 16 citations
- 1910.134(d)(2) Respirators for IDLH atmospheres 10 citations
- 1910.134(d)(2)(i) 9 citations
Get your crew competent
Trainers on Black Belt Safety: Marc Harvey, Dana Reyes
Trainers and suppliers: feature your business on this rule for $25/month.
About this page
Sources
- 29 CFR 1910.134 (eCFR), text current as of 2026-10-15
- U.S. Department of Labor enforcement data: OSHA inspections, citations and accident records, copied nightly; data as of 2026-10-20
3-year window. Federal OSHA only; state-plan rules are not counted. Plain-language text is a summary, not legal advice; the official text controls. Black Belt Safety is not part of OSHA or the Department of Labor.