Summary: The article considers the dynamics of the level of air pollution in Krasnoyarsk 25 years. Analysis of the received information indicates a decrease in the level of contamination, since 1992, 8 times. Installed substances that make the greatest contribution to environmental pollution (50% of nitrogen dioxide, 25% - fluoride), have a significant technological impact on the natural complex of the city and causing a modification of its biotic components.

Keywords: man-made impacts, the maximum allowable concentration, urban environment, green spaces.

Summary. Examined growth and fruiting trees and shrubs of the European flora in the Arboretum of the Siberian State Technological University. Trees aged 44-56 years have a height of 4.0-10.7 m, shrubs - 0.8-4.9  m. Allocated types and instances, promising for introduction in the green area of Krasnoyarsk.

Keywords: introduction, Arboretum, European flora, growth, fruition.