This study aims to compare the level of carbon monoxide (CO) air quality in Green Open Space (GOS) and Non-Green Open Space (NGOS) along the Abepura–Sentani main road in Jayapura City. The research was conducted in two locations: the Taman Makam Pahlawan Denzipur Waena (GOS) and the front area of Mega Waena (NGOS). CO levels were measured using a CO smart sensor over a period of one week, with measurements taken in the morning, noon, and afternoon at six sampling points. The findings indicate that CO concentrations are significantly lower in GOS areas compared to NGOS areas. The presence of vegetation in GOS helps reduce CO pollution by acting as a natural filter. These results highlight the importance of maintaining and developing green open spaces in urban areas as part of efforts to reduce air pollution and improve public health.

Coastal areas are transitional areas between land and marine ecosystems that are very vulnerable to natural disasters, one of which is abrasion. Coastal abrasion is the process of erosion of coastal areas caused by wave activity, ocean currents, and human activities such as infrastructure development and sand mining. Ciberi Beach (Tanjung Ciberi) located in Enggros Village, Abepura District, Jayapura City, is one of the coastal areas that experiences continuous abrasion. Its strategic location and direct facing the Pacific Ocean makes this area very vulnerable to coastal erosion. Based on the author's experience while conducting Field Work Practices at the Papua River Basin Center (BWS Papua), it is known that abrasion has caused damage to public facilities and significant coastline decline since 2019 (Cepos, 2024). Strong suspicions arose from the community based on the results of interviews conducted that the construction of the Youtefa Bridge contributed to the acceleration of abrasion. Previous research also showed that the rate of abrasion in the Yos Sudarso Bay area, including Ciberi Beach, reached 0.89 meters per year. Therefore, this study aims to analyze the level of damage to Ciberi Beach due to abrasion during the period 2014–2024, and to provide recommendations for handling to reduce the impact of damage in the coastal area.

Jayapura City There is Abepura District which has supporting economic infrastructure so that economic growth in Abepura District is very rapid. The existing city forests in several locations in Abepura District need to be improved or expanded to improve their function. This study aims to see the spatial planning policy in Jayapura City related to the area of ??the Abepura District city forest, analyze the implications of the Jayapura City spatial planning policy on the area of ??the Abepura District City Forest, and Analyze the Suitability of Abepura District City Forest Land. This research method uses qualitative descriptive analysis and Spatial Analysis to obtain a picture of the area of ??the Abepura District City Forest as well as a picture of land conversion and the suitability of the Abepura District City Forest land. The results of this study are that the area of ????Approximately 997 hectares of City Forest is in Abepura District According to the 2014 Jayapura City Spatial Policy Data, the City Forest Development policy has only been carried out once in Organda over the past few years, while policies that reduce the area of ????City Forest Many are carried out in housing, building and road development activities, this is because on average the development already has a land permit and a building permit. This study provides an overview that the problem of the reduced area of ??the Abepura District City Forest occurs because the Jayapura City Government is not firm enough in implementing the Jayapura City Spatial Planning Policy in development so that it is in accordance with the Area Designation.