CCOHS: Occupational Hygiene - Occupational Exposure Limits
May 10, 2024 · Threshold Limit Value – Time-Weighted Average (TLV-TWA): the time-weighted average concentration of a hazardous substance in the air averaged over an 8-hour workday …
value of TLV-TWA for maximum 15 minutes, for a maximum of four occasions spaced at least. one hour apart during a workday. The exposure should never exceed 5 times the TWA and the …
Noise - Occupational Exposure Limits for Extended Workshifts
How do I calculate the exposure limit? Back to top Equal energy rule. As an example, the International Organization for Standardization standard ISO 1999:2013 Acoustics — …
Converting Occupational Exposure Limits from mg/m³ to ppm
When can I convert mg/m 3 to ppm? Back to top. Occupational exposure limits (OELs, threshold limit values (TLVs), permissible exposure levels (PELs), etc.) can be expressed in parts per …
CCOHS: Carbon Monoxide
May 10, 2024 · ACGIH® TLV® - TWA: 25 ppm BEI. Exposure Guideline Comments: TLV® = Threshold Limit Value. TWA = Time-Weighted Average. BEI® = Biological Exposure Index. …
CCOHS: Silica, quartz
Mar 11, 2025 · ACGIH® TLV® - TWA: 0.025 mg/m 3 A2 (respirable) Exposure Guideline Comments: TLV® = Threshold Limit Value. TWA = Time-Weighted Average. A2 = Suspected …
CCOHS: Methane - Canadian Centre for Occupational Health and …
May 10, 2024 · ACGIH® TLV® - TWA: Minimal oxygen content required. (D) (EX) Exposure Guideline Comments: TLV® = Threshold Limit Value. TWA = Time-Weighted Average. (D) …
CCOHS: Trichloroethylene
May 10, 2024 · ACGIH® TLV® - TWA: 10 ppm A2 BEI® ACGIH® TLV® - STEL [C]: 25 ppm A2. Exposure Guideline Comments: TLV® = Threshold Limit Value. TWA = Time-Weighted …
Asbestos - Control Strategies for Workplaces - Canadian Centre …
May 10, 2024 · TIME-WEIGHTED AVERAGE (TLV®-TWA): 0.1 fibers per cubic centimeter (f/cc)* - Carcinogenicity Designation A1. The TLV® basis for this rating is pneumoconiosis, lung …
CCOHS: Ammonia - Canadian Centre for Occupational Health and …
ACGIH® TLV® - TWA: 25 ppm. ACGIH® TLV® - STEL [C]: 35 ppm. Exposure Guideline Comments: TLV® = Threshold Limit Value. TWA = Time-Weighted Average. STEL = Short …