Source: http://regpub.com/1910-subpart-z-1910-1000-air-contaminants/
Timestamp: 2019-11-11 21:52:48
Document Index: 469997044

Matched Legal Cases: ['§1910', 'art 1911', '§1910', '§1910', '§1910', '§1910', '§1910', '§1910', '§1910', '§1910', '§1910', '§1910', 'art 1910', '§1910', '§1910', '§1910', '§1910', '§1910', '§1910', '§1910', '§1910', '§1910', '§1919', '§1910', '§1910', '§1910']

Subpart Z - §1910.1000 - Air contaminants. - RegPub!
Authority: 29 U.S.C. 653, 655, 657; Secretary of Labor’s Order No. 12-71 (36 FR 8754), 8-76 (41 FR 25059), 9-83 (48 FR 35736), 1-90 (55 FR 9033), 6-96 (62 FR 111), 3-2000 (65 FR 50017), 5-2002 (67 FR 65008), 5-2007 (72 FR 31160), 4-2010 (75 FR 55355), or 1-2012 (77 FR 3912); 29 CFR part 1911; and 5 U.S.C. 553, as applicable.
Source: 39 FR 23502, June 27, 1974, unless otherwise noted. Redesignated at 40 FR 23072, May 28, 1975.
§1910.1000 – Air contaminants.
§1910.1000(a)
§1910.1000(a)(1)
Substances with limits preceded by “C” — Ceiling Values.
An employee’s exposure to any substance in Table Z-1, the exposure limit of which is preceded by a “C”, shall at no time exceed the exposure limit given for that substance. If instantaneous monitoring is not feasible, then the ceiling shall be assessed as a 15-minute time weighted average exposure which shall not be exceeded at any time during the working day.
§1910.1000(a)(2)
Other substances — 8-hour Time Weighted Averages.
An employee’s exposure to any substance in Table Z-1, the exposure limit of which is not preceded by a “C”, shall not exceed the 8-hour Time Weighted Average given for that substance in any 8-hour work shift of a 40-hour work week.
§1910.1000(b)
Table Z-2.
An employee’s exposure to any substance listed in Table Z-2 shall not exceed the exposure limits specified as follows:
§1910.1000(b)(1)
8-hour time weighted averages.
An employee’s exposure to any substance listed in Table Z-2, in any 8-hour work shift of a 40-hour work week, shall not exceed the 8-hour time weighted average limit given for that substance in Table Z-2.
§1910.1000(b)(2)
Acceptable ceiling concentrations.
An employee’s exposure to a substance listed in Table Z-2 shall not exceed at any time during an 8-hour shift the acceptable ceiling concentration limit given for the substance in the table, except for a time period, and up to a concentration not exceeding the maximum duration and concentration allowed in the column under “acceptable maximum peak above the acceptable ceiling concentration for an 8-hour shift.”
§1910.1000(b)(3)
During an 8-hour work shift, an employee may be exposed to a concentration of Substance A (with a 10 ppm TWA, 25 ppm ceiling and 50 ppm peak) above 25 ppm (but never above 50 ppm) only for a maximum period of 10 minutes. Such exposure must be compensated by exposures to concentrations less than 10 ppm so that the cumulative exposure for the entire 8-hour work shift does not exceed a weighted average of 10 ppm.
§1910.1000(c)
Table Z-3.
An employee’s exposure to any substance listed in Table Z-3, in any 8-hour work shift of a 40-hour work week, shall not exceed the 8-hour time weighted average limit given for that substance in the table.
§1910.1000(d)
Computation formulae.
The computation formula which shall apply to employee exposure to more than one substance for which 8-hour time weighted averages are listed in subpart Z of 29 CFR part 1910 in order to determine whether an employee is exposed over the regulatory limit is as follows:
§1910.1000(d)(1)
§1910.1000(d)(1)(i)
E = (Ca Ta + Cb Tb + . . .Cn Tn) ÷ 8
§1910.1000(d)(1)(ii)
(2 × 150 + 2 × 75 + 4 × 50) ÷ 8 = 81.25 ppm
§1910.1000(d)(2)
§1910.1000(d)(2)(i)
Em = (C1 ÷ L1 + C2 ÷ L2) + . . .(Cn ÷ Ln)
§1910.1000(d)(2)(ii)
§1910.1000(e)
Table Z-1 – Limits for Air Contaminants
mg/m3 (b)1
Beryllium and beryllium compounds (as Be); see 1910.10248 7440-41-7
7440-47-3 0.5
Cristobalite; see 1910.10537
Quartz; see 1910.10537
Tripoli (as quartz); see 1910.10537
Tridymite; see 1910.10537
12001-26-2 (3)
14807-96-6 (3)
(c) The CAS number is for information only. Enforcement is based on the substance name. For an entry covering more than one metal compound, measured as the metal, the CAS number for the metal is given — not CAS numbers for the individual compounds.
(e) This 8-hour TWA applies to respirable dust as measured by a vertical elutriator cotton dust sampler or equivalent instrument. The time-weighted average applies to the cottom waste processing operations of waste recycling (sorting, blending, cleaning and willowing) and garnetting. See also 1910.1043 for cotton dust limits applicable to other sectors.
7 See Table Z-3 for the exposure limit for any operations or sectors where the exposure limit in §1910.1053 is stayed or is otherwise not in effect.
8 See Table Z-2 for the exposure limits for any operations or sectors where the exposure limits in §1910.1024 are stayed or otherwise not in effect.
Benzenea (Z37.40-1969) 10 ppm 25 ppm 50 ppm 10 minutes.
Beryllium and beryllium compounds (Z37.29-1970)d 2 µg/m3 5 µg/m3 25 µg/m3 30 minutes.
Cadmium fumeb (Z37.5-1970) 0.1 mg/m3 0.3 mg/m3
Cadmium dustb (Z37.5-1970) 0.2 mg/m3 0.6 mg/m3
Methylene Chloride: See §1919.52.
c This standard applies to any operations or sectors for which the exposure limit in the Chromium (VI) standard, §1910.1026, is stayed or is otherwise not in effect.
d This standard applies to any operations or sectors for which the exposure limits in the beryllium standard, §1910.1024, are stayed or is otherwise not in effect.
Table Z-3 – Mineral Dusts
Quartz (Respirable)f
250b 10 mg/m3 e
Cristobalite: Use 1⁄2 the value calculated from the count or mass formulae for quartzf
Tridymite: Use 1⁄2 the value calculated from the formulae for quartzf
2.4 mg/m3 e
Inert or Nuisance Dust:d
15 5 mg/m3
50 15 mg/m3
Note: Conversion factors – mppcf × 35.3 = million particles per cubic meter = particles per c.c.
a Millions of particles per cubic foot of air, based on impinger samples counted by light-field techniques.
b The percentage of crystalline silica in the formula is the amount determined from airborne samples, except in those instances in which other methods have been shown to be applicable.
c Containing less than 1% quartz; if 1% quartz or more, use quartz limit.
d All inert or nuisance dusts, whether mineral, inorganic, or organic, not listed specifically by substance name are covered by this limit, which is the same as the Particulates Not Otherwise Regulated (PNOR) limit in Table Z-1.
[58 FR 35340, June 30, 1993; 58 FR 40191, July 27, 1993, as amended at 61 FR 56831, Nov. 4, 1996; 62 FR 1600, Jan. 10, 1997; 62 FR 42018, Aug. 4, 1997; 71 FR 10373, Feb. 28, 2006; 71 FR 16673, Apr. 3, 2006; 71 FR 36008, June 23, 2006; 81 FR 16861, Mar. 25, 2016; 81 FR 31167, May 18, 2016; 81 FR 60272, Sept. 1, 2016; 82 FR 2735, Jan. 9, 2017]
Subpart Z - §1910.1001 - Asbestos.