People always polluted their surroundings. But until now pollution was not such a serious problem. People lived in rural areas and did not produce such amount of polluting agents that would cause a dangerous situation in global scale. With the development of overcrowded industrial highly developed cities, which put huge amounts of pollutants into surrounds, the problem has become more and more dangerous. Today our planet is in serious danger. Acid rains, global warming, air and water pollution, and overpopulation are the problems that threaten human lives on the Earth. In order to understand how air pollution affects our body, we must understand exactly what this pollution is. The pollutants that harm our respiratory system are known as particulates. Particulates are the small solid particles that you can see through rays of sunlight. They are products of incomplete combustion in engines, for example: internal-combustion engines, road dust and wood smoke. Green plants efficiently purify urban air from dust . Polluted air flow encounters green array slows down , resulting in under the influence of gravity 60-70% of the dust contained in the air settles on trees and shrubs. Some dust falls out of the air flow, bumping into the trunks , branches and leaves. Much of the dust settles on the surface of leaves , needles , twigs , trunks. During the rain washed away the dust on the ground. Under vegetation due to temperature differences arise downdrafts, which also carried away the dust on the ground. Dissemination or impede the movement of dust not only trees and shrubs, but also lawns, which retard the progressive movement of dust, wind distilled from different places. Of green space dust in the air is 2-3 times less than in open urban areas. Tree plantation reduce dustiness of air, even in the absence of foliage. Based on the above material there is a conclusion about the feasibility and the real benefits of the activities related to the greening of urban areas. This is proved by historical experience as well as the realities of modern urban existence.