It has long been proven that vegetation on the site, and especially shrubs and trees with their foliage, absorb more than 90% of dust and dirt, leafless plants no more than 70%. Therefore, deciding to create a hedge, it is necessary to give preference to deciduous species rather than conifers. Ash and maples are especially good at absorbing dirt and dust, since such trees have a dense and wide crown. The crowns of such trees absorb noise, attract insects and birds..
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Practically trees of the same type, depending on the place of planting, can be very different from one another. This is due to the ecological state of the settlement — in sparsely populated areas, the crowns of shrubs and trees are green and lush, near roads and factories — they are yellower and beaten by diseases. Also, in areas with a poor ecological situation, evergreens shed their deciduous cover for the winter, which is excluded in principle. Coniferous plants tolerate dirty air very poorly; under the harmful influence of toxic compounds, needles grow poorly and die. Some exceptions can be considered mountain and black pine, western or Serbian spruce and thuja of any species. It has also been proven that trees have a positive effect on the human psyche..