In photochemical reactions that take place intensively in the sunshine, produced highly toxic air pollutants. The main sources of its occurrence is vehicle exhaust. On the formation of smog affect environmental factors: temperature, wind, insolation, and the importance of others.

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Large number of vehicles in the city throws a lot of exhaust gases, which do not rise up and do not dissipate in the atmosphere, and warm gases of harmful substances remain in the immediate vicinity of the earth's surface. This affects vegetation, animals, and, of course, man. Photochemical smog in their physiological effects on the human body is extremely dangerous, especially for respiratory and circulatory systems, which often causes premature death of urban residents with impaired health.

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This could - not unusual in many major cities around the world. However, the green areas can not absorb too many contaminants. All this leads to an increase in various diseases of urban residents. Pollutants on the environment include freon. It's (chlorofluorocarbons), volatile, chemically inert in the earth's surface material, widely used in the production and daily life in refrigerators, air conditioners, foam, spray in aerosol containers.

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They are synthesized in a 30-years and have been widely used in industrial production only since the early 60's. CFCs, rising into the upper atmosphere, undergo photochemical decomposition to form chlorine monoxide, ozone depleting rapidly. Length of stay CFCs in the atmosphere of 50-200 years. Excessive use of them led to the emergence of environmental problems on a global scale depletion of the ozone layer, whose particular case is the emergence of "ozone hole" over Antarctica and the Arctic. In addition, freon play a significant role in creating the greenhouse effect. In some countries will gradually decrease the production of CFCs and are environmentally safe substitutes