Reference

Most OSHA PELs derive from 1968 ACGIH TLVs and have not been updated since 1971 — ACGIH updates TLVs annually. For many chemicals the TLV is 5–20× lower than the PEL, requiring a higher APF respirator. ANSI/ISEA Z88.2 directs employers to use the most protective OEL. This guide covers the practical selection implications.

OSHA 1910.134(f) requires annual fit testing for all tight-fitting respirators. This guide covers 4 QLFT protocols (isoamyl acetate, saccharin, Bitrex, irritant smoke), 3 QNFT protocols (generated aerosol, PortaCount, CNP), pass/fail fit factor thresholds, the facial hair rule, recordkeeping, and a 6-step full-face APR onboarding example.

OSHA 29 CFR 1926.1153 is the construction silica standard. It sets a PEL of 50 µg/m³, allows Table 1 engineering controls as a compliance option, and requires written exposure control plans and medical surveillance when applicable. This guide covers each compliance option and respirator selection for concrete grinding and masonry work.

OSHA 29 CFR 1910.134 governs respiratory protection programs across general industry and construction. This guide covers every major section: written programs, APF selection, medical evaluations, fit testing, user seal checks, cartridge change-out, IDLH requirements, training, recordkeeping, and a step-by-step compliance example.

ANSI/ISEA Z88.2 is the consensus respiratory protection program standard, providing guidance that goes beyond OSHA 1910.134 minimums. It covers hazard identification, respirator selection, written programs, fit testing, and program evaluation. This guide explains Z88.2's structure and how it relates to 1910.134 and NIOSH 42 CFR Part 84.

NIOSH 42 CFR Part 84 governs respirator certification in the U.S., replacing the Bureau of Mines standard in 1995. It defines the N/R/P oil-resistance classification and 95/99/100 filtration tiers. This guide covers the approval process, TC number anatomy, and step-by-step Certified Equipment List verification with a worked example.