The current stage of development of human civilization involves a huge number of all kinds of devices and assemblies. They significantly increase the comfort of living and the effectiveness of human life, but they have a significant negative impact on both people and their external environment. Such an interaction is characterized by the state of the microclimate, the level of vibration and noise, as well as the content of substances harmful to health in the ground, water and air.
The maximum permissible concentration (MPC) is an approved indicator included in regulatory documents, which presents the requirements and recommendations of state sanitary-hygienic centers for the efficient and safe use of natural resources (air, soil, water). This allows not only normalizing the amount of emissions from industrial enterprises, but also calculating the damage that will be caused to the environment.
MPC is the maximum concentration of a harmful substance that slightly affects human health, the natural community and its individual components.
Harmful substances are classified by the degree of influence exerted on the human body. In accordance with regulatory documents, four hazard classes are distinguished . In addition, harmful compounds are divided into several groups according to the nature of their interaction with the human body. They produce suffocating, irritating, somatic and narcotic substances.
Let us consider in more detail the MPC of harmful substances in the air. Most often, the concept presented is understood as the one-time maximum value of dangerous compounds that penetrate the human body through breathing or through the skin. Sampling is performed several times during the period under review. Next, the average value is calculated. Distinguish between a single maximum and average daily dose. In this regard, the MPC of atmospheric air in the area of the working area is a level of harmful substance that does not cause various diseases during the daily process during a fairly long period.
MPC is an indicator not only of the state of the atmosphere. Even foodstuffs entering stores are normalized. Since harmful substances that enter the body tend to accumulate, a person is exposed to significant influences over his life.
MPC is the permissible content of one specific substance. However, if several hazardous compounds are observed in the atmosphere, soil or water, then the harm they cause will be added up. In accordance with the norms, even the joint level of harmful substances should not exceed 1. However, in many areas this rule is not respected, resulting in an increased risk of developing some chronic and fatal diseases. It should also be borne in mind that MPC is an indicator calculated for an average person. That is, if your body is weakened, you are more susceptible to the negative effects of hazardous substances.