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https://www.atsdr.cdc.gov/sites/toxzine/benzene_toxzine.html#:~:text=The%20maximum%20allowable%20amount%20of%20benzene%20in%20workroom,the%20recommended%20%288-hour%29%20exposure%20limit%20of%200.1%20ppm.
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1028
The employer shall establish a regulated area wherever the airborne concentration of benzene exceeds or can reasonably be expected to exceed the permissible exposure limits, either the 8-hour time weighted average exposure of 1 ppm or the short-term exposure limit of 5 ppm for 15 minutes.
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1028AppA
1. Airborne: The maximum time-weighted average (TWA) exposure limit is 1 part of benzene vapor per million parts of air (1 ppm) for an 8-hour workday and the maximum short-term exposure limit (STEL) is 5 ppm for any 15-minute period. 2. Dermal: Eye contact shall be prevented and skin contact with liquid benzene shall be limited.
https://oehha.ca.gov/air/general-info/oehha-acute-8-hour-and-chronic-reference-exposure-level-rel-summary
Xylenes: technical mixture (1330-20-7) and o-xylene (95-47-6), m-xylene (108-38-3) and p-xylene (106-42-3) isomers. [1] REL types: A = acute, 8 = 8-hour, C = chronic. Exposure averaging time for acute RELs is 1 hour. For 8-hour RELs, the exposure averaging time is 8 hours, which may be repeated.
https://www.bp.com/content/dam/bp/country-sites/en_us/united-states/home/documents/products-and-services/pipelines/contractor-information/uspl/benzene-policy.pdf
A. Benzene exposure shall not exceed 1.0 part per million (ppm) unless respiratory protection is used in accordance with the Respiratory Protection Policy. B. An Action Level of 0.5 ppm as an 8-hour TWA shall be used to determine additional monitoring, medical surveillance, and additional employee training.
https://oehha.ca.gov/media/downloads/crnr/appendixd1final.pdf
Benzene Reference Exposure Levels 139. Benzene Reference Exposure Levels 139. 1,3-Butadiene Reference Exposure Levels 217. ... as the basis for the 8-hour and chronic REL. Children, especially those with diagnosed asthma, may be more likely to show impaired :
https://www.epa.gov/sites/production/files/2014-08/documents/benzene_interim_dec_2008_v1.pdf
9 exposure periods ranging from 10 minutes to 8 hours. AEGL-2 and AEGL-3 levels, and AEGL-1 levels as 10 appropriate, will be developed for each of five exposure periods (10 and 30 minutes, 1 hour, 4 hours, and 8 11 hours) and will be distinguished by varying degrees …
https://www.cdc.gov/niosh/idlh/71432.html
It has also been stated that exposure at 19,000 to 20,000 ppm for 5 to 10 minutes is fatal; exposure at 7,500 ppm for 30 minutes is dangerous; exposure at 1,500 ppm for 60 minutes induces serious symptoms; exposure at 500 ppm for 60 minutes leads to symptoms of illness; exposure at 50 to 150 ppm for 5 hours produces headache, lassitude, and weakness; and exposure at 25 ppm for 8 hours has no …
https://www.npr.org/sections/thetwo-way/2016/01/15/463178568/gas-company-understated-benzene-exposure-from-california-leak
California's EPA has defined stricter levels for benzene: 8 ppb for acute exposure (one hour) and 1 ppb for eight-hour or chronic exposure. The World Health Organization maintains there is …
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https://www.epa.gov/aegl/benzene-results-acute-exposure-guideline-levels-aegl-program
AEGLs for Benzene, CAS 71-43-2, represent threshold exposure limits for the general public and are applicable to emergency exposure periods ranging from 10 minutes to 8 hours; Human health hazards of benzene acute exposure and derivation of AEGL values.
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