The availability of green open space in Kendari City tends to decrease in several areas due to the massive physical development carried out in the last 5 years. The aims of this study are: 1) to analyze the distribution of green open space using Sentinel 2A imagery; and 2) estimating the need for green open space using the oxygen demand approach so that there is a balance between oxygen supply and demand. This type of research is a case study, where an in-depth analysis of data and facts related to the object of research is carried out. The method used is to combine field data (field research) and literature (desk research). In this study, an analysis was carried out on Sentinel 2A imagery to obtain the normalized difference vegetation index (NDVI) value as a parameter to distinguish vegetation and non-vegetation and a ground check was carried out to determine the actual condition of green open spaces. Furthermore, the determination of the area based on oxygen demand using the Gerakis formula. The results showed that: 1) Ecologically Kendari City has a good environmental carrying capacity because the green open space is still very wide, namely 19,458.94 hectares or 72.52% of the city area; and 2) The total area of ​​green open space needed in Kendari City is 1,927.79 hectares. Furthermore, based on the three classifications of consumers, it can be seen that motorized vehicles are the most dominant oxygen consumers, amounting to 1,347,576.42 kg/day, while the need for oxygen for humans tends to be the least, which is 298,175.04 kg/day. Currently, the existing green open space of Kendari City's NDVI is 19,458.94 hectares, this means that the available green open space in the city of Kendari is able to accommodate oxygen needs so that currently it is considered that there is no need to increase the area of ​​green open space.