Limits employee exposure to every substance listed in Tables Z-1, Z-2 and Z-3. Table Z-1: a limit preceded by "C" is a ceiling that must at no time be exceeded; if instantaneous monitoring is not feasible the ceiling is assessed as a 15-minute TWA not to be exceeded at any time in the working day. Other Z-1 limits are 8-hour TWAs not to be exceeded in any 8-hour shift of a 40-hour week. Values are in ppm (by volume at 25 C and 760 torr) or mg/m3, determined from breathing-zone samples; an "X" marks a skin designation. Particulates not otherwise regulated (PNOR) are 15 mg/m3 total dust and 5 mg/m3 respirable fraction. Table Z-2: an 8-hour TWA, an acceptable ceiling concentration that may be exceeded only up to the listed acceptable maximum peak and for no longer than its maximum duration (for example benzene 10 ppm TWA, 25 ppm ceiling, 50 ppm peak for 10 minutes, applying only to segments exempt from 1910.1028; toluene 200/300/500 ppm, 10 minutes). Z-2 limits for beryllium, cadmium and chromic acid apply only where 1910.1024, 1910.1027 or 1910.1026 is stayed or not in effect. Table Z-3 sets mineral dust limits in mppcf or mg/m3 (for example respirable quartz 10 mg/m3 divided by %SiO2 + 2; inert or nuisance dust 15 mg/m3 total and 5 mg/m3 respirable), applying to crystalline silica only where 1910.1053 is stayed or not in effect. Paragraph (d) prescribes the formulae: cumulative shift exposure E = (CaTa + CbTb, continuing through CnTn) divided by 8 must not exceed the TWA, and for mixtures Em = C1/L1 + C2/L2, continuing through Cn/Ln, must not exceed 1. Paragraph (e) requires administrative or engineering controls first wherever feasible; where they cannot achieve full compliance, protective equipment or other measures must keep exposure within the limits, any such equipment or technical measure must be approved for each use by a competent industrial hygienist or other technically qualified person, and respirator use must comply with 1910.134.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.