The atmosphere (from the Greek words atmos - air and sphaira - ball) is not only the air that humans, animals and plants use to breathe, but also the gaseous envelope of our planet that protects it from sudden temperature fluctuations (without the atmosphere, daily temperature fluctuations on Earth could reach 200 °C) and protects all living organisms from harmful radiation from the Sun and space. The atmosphere is also the environment in which climate, winds and rainfall form; it is also the environment in which weather, which plays an important role in agriculture, is created. The direct and indirect effects of atmospheric (outdoor) air on humans are varied. Before considering the problem of protecting the air environment from various pollutants, let us give brief information about its structure and gas composition.