What indicators of the quality of the atmosphere, water and soil do you know?

What indicators of the quality of the atmosphere, water and soil do you know? What is the maximum permissible concentration for atmospheric pollution, aquatic environment and soil?

The main environmental quality standard is the maximum permissible concentration (MPC) of harmful substances in the atmosphere.
MPC is the maximum amount of a harmful substance per unit volume or mass, which during periodic exposure or during exposure throughout a person’s life does not harm him or the environment as a whole (including long-term consequences).
In relation to atmospheric pollution, two types of MPC have been established: maximum one-time and average daily. The maximum one-time MPC is the main hazard characteristic of a harmful substance. It corresponds to a short-term (20 min) exposure to atmospheric impurities. The daily average MPC is the amount of impurity that does not directly or indirectly affect a person under conditions of an indefinitely long round-the-clock inhalation.
With regard to the aquatic environment, quality standards have been established for three types of water use: drinking, communal, and fisheries. Therefore, for the aquatic environment, MPC is the amount of a substance in the water, above which the water is not suitable for the specified type of use. Epidemiological safety of water is determined by the number of microorganisms contained in it (in one cubic millimeter there should be no more than one hundred) and bacteria of the group of Escherichia coli (in one liter of water there should be no more than three). Toxicological indicators characterize the harmlessness of the chemical composition of water and include standards for substances found in natural waters added to water during processing in the form of reagents, as well as those appearing as a result of industrial, agricultural, domestic and other pollution of the water supply source.
The standards of chemical pollution of soils are established at the maximum permissible concentrations for water and air. This is due to the fact that the influx of harmful substances into the body directly from the soil occurs in extremely rare cases and in insignificant quantities, and occurs mainly through media in contact with the soil (air, water, plants). In addition, there is MPC of the soil – this is the amount of a chemical substance (in milligrams per kilogram of soil) in the arable soil layer, which should not cause a direct or indirect negative impact on the environment and human health in contact with the soil, as well as on the ability of the soil to self-clean.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.