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The problem of green open space (RTH) in terms of quantity and quality was currently experiencing a significant decline. It impacted the decreasing quality of the living environment of urban residents. It should not have happened because of the existence of Law Number 26 of 2007 concerning Spatial Planning. It states that urban spatial planning must include a plan for the provision and utilization of green open space with a minimum area of 30% of the total area of the city, the problem of green open space had been proven in studies including (1, 2, 4, 8, 10, 11). None of the RTH research above had examined the need for green space for oxygen after the earthquake, tsunami, and liquefaction on September 28, 2018, in Palu City. Therefore, this study aims to determine the green open space in Palu City after the disaster based on oxygen to Palu City in 2019. This research was carried out in Palu City, Central Sulawesi. The method used was descriptive analysis and used the Gerakis formula (1974) modified by Wisesa (1988) to calculate the adequacy of green open space based on the oxygen required in Palu City. The results showed that the oxygen demand for the population of Palu in 2019 was 197.43 ha, which was very far from the actual data on the area of green open space in Palu City, which was 1,679.51 ha. Three districts had not met the needs of oxygen, namely West Palu, East Palu, and South Palu Districts, all of which were in the centre of Palu City and experienced a disaster. There was a change in land function from Green Space to settlement and temporary shelter and permanent shelter after the disaster.

Green Space Based on Oxygen Needs Post-Disaster in Palu City, Central Sulawesi, Indonesia