ADEQUACY OF GREEN OPEN SPACE TO REDUCE CARBON DIOXIDE (CO2) AT UNESA CAMPUS JL. KETINTANG, SURABAYA, INDONESIA

Abstract

Academic activity at the Unesa Ketintang Campus Surabaya Indonesia, to some extent, contributed to the increase of CO₂ concentration in Surabaya City. The increase in CO₂ concentration can be balanced by green open space. This study aims to determine the adequacy of green open space in Unesa Ketintang Street Campus in reducing CO₂ in ambient air. The analysis unit uses a box model. The observation was carried out for six days in July-August 2021. The adequacy of green open space uses the CO₂ reduction value (Net_CO₂-Con), an indicator of reducing CO₂ concentrations. Net_CO₂-Con value is the cumulative concentration of CO₂ in the surrounding air for 24 hours. The study results show that from 7 observation points, the average CO₂ concentration ranges from 417 – 425 ppmV. The CO₂ concentration reduction value (Net_CO₂-Con) ranges from -19.46 to -87.69 ppmV. The minus sign (-) on the reduction value indicates that the green open space on the Unesa Campus is sufficient to reduce the CO₂ concentration in the ambient air.