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.

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.

N95 vs P100 Respirators: N95 and P100 are both NIOSH filter efficiency classes under 42 CFR Part 84, but they differ on two dimensions: filtration efficiency (N95 = 95% minimum; P100 = 99.97% minimum) and oil resistance (N = not oil-resistant; P = oil-proof).