The most informative parameters of woody plants living condition are analyzed, which should be used for the ecological monitoring of urbanized and oil-contaminated areas. The reactions of the plant organism at different levels of the biosystem organization in response to the action of priority pollutants of the technogenic-transformed environment – heavy metals and oil products – are provided. The relevance of the study of oil pollution as one of the current main environmental problems is substantiated. The adaptive-protective reactions characteristic of the resistant plant species and destructive changes in the stress-sensitive phytoobjects are highlighted. It is established that the widest range of plant reactions to the man-made environmental impacts can be found at the molecular, cellular and organ levels of biosystems organization. Based on a set of morphological, physiological, cytological, histological and phenological processes of plants, it is recommended to use indicator species in biomonitoring studies, and remediative species – in the reclamation measures for the anthropogenically altered areas. The authors have highlighted the methodical approaches to assessing the ecological condition of urbanized and oilcontaminated ecosystems, based on the specifics of zoning and choice of background area. The classes of vitality and the categories of plant stability are characterized based on the percentage deviation of the analyzed plant parameters from the background values. The prospects of green plantations as the primary producers of organic matter and recipients of the complex impact of biotic, abiotic and anthropogenic environmental factors are substantiated. The criteria for sampling plant material for bioindication studies to obtain reliable factual data are described. The relationship between the processes that occur at all levels of the biosystem hierarchy of the plant organism – from molecular to ecosystem – is highlighted. Based on establishing the living condition of the green areas of urbanized and oil-contaminated areas, it is possible to timely record the slightest changes in the ecological state of the environment and to prevent further negative trends in it