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Per capita green space is a quantitative measurement which is used to evaluate environmental sustainability of a city. Current high rate of urbanization and its impacts reduce green spaces gradually and remarkably. The main objective of the current study is to evaluate the present situation of Colombo city and its sustainability using per capita green space standards which have been defined by UN, WHO and EU. This study further compares Colombo with other major cities in the South Asian region. A timeseries of Landsat images from 1980 to 2015, with the NDVI differencing technique, were used to prepare relevant green space maps in a GIS environment. Results of the study show a decrease (from 31.0km 2 in 1980 to 5.02km 2 in 2015) of green space in the city area and the per capita value recorded in 2015 (7.16m 2 ) is below WHO standard of 8m 2 . Thus, it can be concluded that Colombo is not in a secure position in maintaining its green spaces. However, when comparing with 06 other cities in the region, it is observed that the situation in Colombo is more sustainable than the selected cities. This study recommends to analyze the problem at smaller sized administration units, the necessity of attention of policy makers and planners, and a comprehensive city plan.

Is Colombo city, Sri Lanka secured for urban green space standards?