The main gases in the atmosphere are nitrogen, oxygen and rhinoceros. These gases are almost constant throughout the troposphere. Approximately 4/5 of the atmosphere consists of nitrogen.  The natural sources are the activity of bacteria in soil, lightning, volcanic eruptions. Their main anthropogenic sources

Combustion at temperatures above 1000 ° C. The nitrogen in the atmosphere passes through the Earth's surface in various forms. Nitrogen enters the earth through rainfall as nitric acid. Nitric acid is converted into nitrate ions in the soil by bacteria, and the plants are fed only with it.

Nitrogen oxides combine with hemoglobin in the blood. It combines with moisture in the lip and creates nitrite acid. As a result of the lack of concentration of acid produced, the effect is also reduced. It accumulates over time and causes disease in the human body. In addition, nitrogen oxides cause aerosol and photochemical smog and cause ozone layer depletion. Nitrogen monoxide is a colorless gas inside nitrogen oxides. It affects the function of the lungs and affects the nervous system.

Due to the acid rainfall, the increase in nitrogen compounds in the soil leads to the reduction of biological diversity by increasing the number of nitrogen-loving and nitrogen-free species, and extraction of other species from the ecosystem. Increasing the nitrogen content of the gulfs, lakes, reservoirs and the sea causes the growth of algae (water flow) and sharp reduction in the amount of oxygen in water (avtophysics).

In general, the pollution of the atmosphere occurs as a result of industrial, transport and other production areas. These spaces also emit large quantities of toxic gases in the atmosphere along with solid particles (aerosols). Sulfur dioxide (SO2), which causes acidic greases in the atmosphere, is more dangerous. Such rains are widespread in Europe, North America, many Asian countries (Japan, China, Indonesia), Latin America (Brazil), which are characterized by high industry development. The release of greenhouse gases, primarily carbon dioxide (CO2) to the atmosphere, particularly causes serious problems. The annual amount of carbon dioxide in the Earth's atmosphere is more than 6 billion tons. Most of these wastes belong to the United States, China, Russia, Japan and Germany.

Sulfur-containing compounds in the air form sulfur (IV) oxide with several successive chemical transformation. The last item mentioned is one of combustion products of sulfur fuels. Airborne nitrogen and sulfur oxides are interacting with water vapor and form suitable acids. These substances come back to the ground with acid rainfall.