CCOHS: Occupational Hygiene - Occupational Exposure Limits
2024年5月10日 · The units of measure for TLV-SL is mg/100 cm 2. For physical hazards, ACGIH defines: Threshold Limit Value – Time-Weighted Average (TLV-TWA)*: The time-weighted average exposure for an 8-hour workday and 40-hour workweek. Threshold Limit Value-Ceiling (TLV-C)*: Exposure limit that should not be exceeded even instantaneously.
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 8-hour TWA should not be exceeded for an 8-hour work period. The units of measures for the TLV-TWAs, TLV-STEL and TLV-C are ppm and mg/m. 3. The
CCOHS: Carbon Monoxide
2024年5月10日 · ACGIH® TLV® - TWA: 25 ppm BEI. Exposure Guideline Comments: TLV® = Threshold Limit Value. TWA = Time-Weighted Average. BEI® = Biological Exposure Index. Adapted from: 2022 TLVs® and BEIs® - Threshold Limit Values for Chemical Substances and Physical Agents and Biological Exposure Indices.
CCOHS: Trichloroethylene
2024年5月10日 · ACGIH® TLV® - TWA: 10 ppm A2 BEI® ACGIH® TLV® - STEL [C]: 25 ppm A2. Exposure Guideline Comments: TLV® = Threshold Limit Value. TWA = Time-Weighted Average. STEL = Short-term Exposure Limit. A2 = Suspected human carcinogen. BEI® = Biological Exposure Index.
CCOHS: Hydrogen Sulfide
2024年5月10日 · ACGIH® TLV® - TWA: 1 ppm. ACGIH® TLV® - STEL [C]: 5 ppm. Exposure Guideline Comments: TLV® = Threshold Limit Value. TWA = Time-Weighted Average. STEL = Short-term Exposure Limit. C = Ceiling limit. Adapted from: 2022 TLVs® and BEIs® - Threshold Limit Values for Chemical Substances and Physical Agents and Biological Exposure Indices.
CCOHS: Silica, quartz
2025年3月11日 · ACGIH® TLV® - TWA: 0.025 mg/m 3 A2 (respirable) Exposure Guideline Comments: TLV® = Threshold Limit Value. TWA = Time-Weighted Average. A2 = Suspected human carcinogen. Adapted from: 2025 TLVs® and BEIs® - Threshold Limit Values for Chemical Substances and Physical Agents and Biological Exposure Indices.
Asbestos - Control Strategies for Workplaces - Canadian Centre …
2024年5月10日 · The TLV® basis for this rating is pneumoconiosis, lung cancer and mesothelioma. TLV® Definitions: *Respirable fibers - Fibers longer than 5 microns and at least 3 times as long as their diameter as determined by the membrane filter method at 400-450 X magnification (4-mm objective) using phase contrast illumination.
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 million (ppm) only if the substance exists as a gas or vapour at …
CCOHS: Ammonia - Canadian Centre for Occupational Health and …
2024年5月10日 · ACGIH® TLV® - TWA: 25 ppm. ACGIH® TLV® - STEL [C]: 35 ppm. Exposure Guideline Comments: TLV® = Threshold Limit Value. TWA = Time-Weighted Average. STEL = Short-term Exposure Limit. C = Ceiling limit. Adapted from: 2022 TLVs® and BEIs® - Threshold Limit Values for Chemical Substances and Physical Agents and Biological Exposure Indices.
CCOHS: Methane - Canadian Centre for Occupational Health and …
2024年5月10日 · ACGIH® TLV® - TWA: Minimal oxygen content required. (D) (EX) Exposure Guideline Comments: TLV® = Threshold Limit Value. TWA = Time-Weighted Average. (D) Simple asphyxiant. (EX) Explosion hazard: The substance is a flammable asphyxiant or excursions above the TLV® could approach 10% of the lower explosion limit.