Abstract
Air hygienic problems in industrial agglomeration areas mainly appear in winter when periods of weak air exchange and persistent low level temperature inversions within high pressure areas cause high concentrations of polluted air. Aerosols and SO 2 are immisions which can entail the formation of SO 2-smog in mid-latitude industrial areas in the winter half of the year. During this season, deciduous trees in public parks, for example, cannot improve city air quality because of the absence of green leaves. In this connection one must ask whether evergreen vegetation can aid the improvement of air quality in agglomeration areas during months when air pollution concentrations are higher than in summer. There are many ways in which evergreen plants can improve air quality in winter (e.g., the social function of green leaves, filtering aerosols, absorption of CO 2 and gaseous pollutants and the production of oxygen by photosynthesis). For these reasons, evergreen vegetation should have received more attention than it has up to the present in planning public gardens in cities for, under certain climatological conditions, different species of evergreen vegetation can also grow in the winter season.
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