What is the limit value of the threshold?

The threshold value of the limit is used to describe the limit under which workers can be exposed daily to the substance. This limit is used in conjunction with concentrated air particles, not liquids. The value of the threshold in the workplace is normally based on eight or seven -hour shifts that are a normal number of hours on a working day. This organization developed the marginal value of the threshold in the age of 40 and 50. The 20th century through extensive research and these values ​​serve as a guide to the industry in the protection of their workers. These values ​​can be applied to industrial ventilation, biological exposure and chemical substances in the workplace.

substances that are included in the Thmesi study The Reshold value includes fumes in the workplace, gases, fog, sprays, steam and dust. All these substances have their own measurements. The sub -and gases are measured in parts per million (PPM) and particles such as fog, vapors, smoke and dust, are measured in milligrams for a cubic meter. The purpose of stAniming the marginal value of the threshold is the protection of workers' health.

For example, formaldehyde is industrial and commercial chemicals, which is quite common in many workplaces. It is a suspicion of human carcinogen, which means that long -term exposure can lead him to cancer. Short -term effects on low formaldehyde concentrations include slight discomfort, such as Ticklish Sensation in the back of the neck. Exposure of a higher concentration can cause lung inflammation, lung edema or even death.

particles are a mixture of liquid droplets and solid particles in the air. Some of these particles are so small that they cannot be seen with the naked eye. The particle sources include industries and power plants. The regulation or limitation of the level of continuous exposure to the sources of these particles will help protect workers.

Between the short -term threshold is the time for which the worker can undergo the maximum exposure limit. This exposure inThe more than normal concentration is compensated by a much shorter continuous time limit, usually 15 minutes, followed by a long break. Such exposures usually cannot be performed no more than four times a day. The limit value of the threshold of the threshold is the highest concentration for which the worker can be subjected at any time, regardless of circumstances.