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The dynamics of the green space in urban areas are key components for the urban environment monitoring options and of the urban planning strategies. In the European Union, specific regulations provide the quantitative measures for green space areas necessary for each inhabitant of a city. To assess the situation in the case of Bucharest, we used the multitemporal analysis of remotely sensed imagery based on Landsat archive available. This enabled us to characterize the possibility to monitor and assess the changes in the vegetation cover over a quarter of a century, and raised a series of issues based on the remote sensing observations and image processing. The quantitative assessment of the green spaces is further developed into proposals related to the green space provisions in urban planning, but also revisions of the quantitative measures used in regulations.