【Basic Knowledge of Occupational Health】: Permissible Exposure Limit for Short-Term Exposure
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This post was last edited by slll611 on 2016-4-24 17:33. What is the short-term exposure limit? GBZ2.1-2007 \"Occupational Exposure Limits for Hazardous Factors in the Workplace _ Part 1 _ Chemical Factors\" defines it as the concentration that allows short-term exposure (15 minutes) under the condition of complying with the PC-TWA (time-weighted average allowable concentration). The character is abbreviated as PC-STEL. GBZ2.1-2007 \"Occupational Exposure Limits for Hazardous Factors in the Workplace _ Part 1 _ Chemical Factors\" provides additional explanations: PC-STEL is a short-term exposure limit that complements PC-TWA, and can be regarded as a supplement to PC-TWA. Used only for short-term exposure to chemicals with high concentrations, which can cause acute effects such as irritation, suffocation, and central nervous system depression, as well as chronic, irreversible tissue damage. Within the limits set by the PC-TWA, short-term exposure at the PC-STEL level does not cause: 1) irritation ； 2) Chronic or irreversible damage ； 3) Toxicological effects with a dose-frequency of exposure dependence ； 4) **The extent is sufficient to increase the accident rate, affect evacuation, and reduce work efficiency. Even when the TWA for that day is within the specified limits, the short-term exposure concentration should not exceed PC-STEL. When the exposure concentration exceeds the PC-TWA and reaches the PC-STEL level, the duration of a single exposure session should not exceed 15 minutes, the number of exposures per workday should not exceed 4, and the interval between consecutive exposures should be no less than 60 minutes.
The short-term exposure allowable concentration refers to the concentration that is permitted for short-term exposure, provided that the time-weighted average allowable concentration is respected.
It refers to the allowable exposure level, on a time-weighted average basis, such that any single exposure within a workday shall not exceed 15 minutes.
The permissible concentration for short-term exposure refers to the concentration that is allowed for short-term exposure while adhering to the time-weighted average permissible concentration, where short-term means 15 minutes
What is the short-term exposure limit? GBZ2.1-2007 \"Occupational Exposure Limits for Hazardous Factors in the Workplace _ Part 1 _ Chemical Factors\" defines it as the concentration that allows short-term (15 min) exposure under the condition of complying with the PC-TWA. The character is abbreviated as PC-STEL.
The short-term exposure allowable concentration refers to the concentration that is permissible for short-term exposure, provided that the time-weighted average allowable concentration is respected
The Permissible Concentration for Short-Term Exposure (PC-STEL) refers to the allowable exposure level, on a 15-minute time-weighted average basis, which must not be exceeded during any single exposure within a workday.
The concentration permitted for short-term exposure, subject to compliance with the time-weighted average allowable concentration.
Permissible concentration for short-term exposure, PC-STEL, refers to the concentration that is allowed for short-term exposure (15 minutes) on the basis of the PC-TWA.