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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://www.cdc.gov/niosh/idlh/71432.html
Dec 04, 2014 · 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 …
https://www.epa.gov/aegl/benzene-results-acute-exposure-guideline-levels-aegl-program
Jan 08, 2021 · 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.Estimated Reading Time: 50 secs
https://ionscience.com/usa/news/understanding-occupational-exposure-limits-for-benzene/
Aug 24, 2020 · The EU-wide 8 hour TWA for benzene is currently set at 1 part per million (ppm), equivalent to a concentration of 3.25mg/m3. However, the ECHA review shows that some member states have a significantly lower OEL value which probably indicates the ‘direction of travel’ for the OEL given that the World Health Organisation (WHO) says there is no safe level of exposure.Estimated Reading Time: 2 mins
https://www.dir.ca.gov/title8/5218.html
Any area where concentrations of airborne benzene exceed or can reasonably be expected to exceed, the allowable employee exposure limits, either the 8-hour time-weighted average exposure limit of 1 ppm or the short-term exposure limit of 5 ppm as averaged over a …
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/air/general-info/oehha-acute-8-hour-and-chronic-reference-exposure-level-rel-summary
Vinyl chloride. 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, …
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