The concentration of lipoid peroxidation products (peroxide groups, diethenoid, triplethenoid conjugate and double links) is estimated in vegetative organs (leaves, roots) of grassplot plants (randall, cocksfoot, red clover) in the conditions of urban environment. Three age groups of plants were used in the current research: virgin (v), middle-aged generative (g2) and subsenile (ss). Accurate modifications in the concentration of lipoid peroxidation products were revealed in the plants in connection with the environmental pollution. The environmental pollution increased the concentration of peroxide groups in vegetative organs of grassplot plants. The maximum concentration of peroxide groups in red clover was viewed in roots, in randall and cocksfoot – in leaves of subsenile cycle. Quick concentration rise of diethenoid, triplethenoid conjugate and double links in the polluted area was revealed in cocksfoot and red clover of the subsenile cycle. Gradual increase of the mentioned features was viewed in randall: from pregenerative to generative and then decrease in the postgenerative period. The results of the research can be applied to describe tolerance of grassplot plants towards anthropogenous environmental conditions and in formulation of ecological and physiological parameters in ontogeny of plants. The results can be used to indicate the condition of the urban environment.