Ecological Systems and Devices Annotation << Back Influence of Solid Atmospheric Fallouts on Plant Development According to Phytotesting Results Goncharov N.V., Prokofieva T.V. In urban conditions, plants are exposed to a number of unfavorable factors, one of which is solid atmospheric fallouts (SAF). When assessing the impact of environmental toxicity of SAF, setting up model experiments with solid substrates, which include soils, is complicated by the current lack of a unifi ed approach to modeling SAF contamination of soils and subsequent assessment of their ecotoxicity. The purpose of the work is to assess the impact of solid atmospheric fallouts on the development of plants in soils under model conditions of dust load. Samples of soddy-podzolic soil were used as background soil. To model the dust load, two dust samples taken from areas near highways were used. Dust application doses are calculated based on average annual data on aerial fallouts in the city of Moscow. Test objects – Watercress (Lepidium sativum L.), perennial ryegrass (Lolium Perenne L.). For plants, the length of roots and germination of seeds were determined. It was found that for watercress, with a SAF application dose corresponding to a load of 50 years, the length of the roots increases. Further increase in dose leads to a decrease in root length. For perennial ryegrass, the pattern of changes in root length is stepwise - after adding dust similar to 100 and 150 years of aerial pollution, a signifi cant decrease in root length occurred. Further addition of dust did not lead to a change in the test parameter. It has been established that germination as a test parameter does not allow assessing the environmental toxicity of SAF in tests on both types of plants. The results of the model experiment showed the infl uence of SAF on plant development. The experimental data obtained showed that the summer dust load of the resedential-transport and transport zones and transport zones was higher than the selected average annual value for the city of Moscow. When using data on dust load near highways instead of city averages, the period of onset of signifi cant negative effects for plants is reduced by 2–4 times. Keywords: environmental toxicological study, urban dust, aerial load, biotesting, anthropogenic pollution. Pp. 03-14.