Journal of Environmental Treatment Techniques 2021, Volume 9, Issue 2, Pages: 428-434 428 Carbon Monoxide Gas Pollution Control Model Using Reducing Plants Natsir Abduh 1 *, Andi Muhibuddin 2 , Z. Zulkarnain 3 , Rumpang Yusuf 4 , Fikruddin Buraerah 5 1 Department of Civil Engineering, Faculty of Engineering, Universitas Bosowa 2 Department of Environmental, Faculty of Agriculture 3 Department of Forestry, Faculty of Forestry and Environmental Science, Universitas Halu Oleo 4 Department of Civil Engineering, Faculty of Engineering, Universitas Bosowa 5 Department of Environmental Engineering, Faculty of Engineering, Universitas Bosowa Received: 29/11/2020 Accepted: 05/01/2021 Published: 20/06/2021 Abstract Objectively, this study addresses several objectives, such as 1) identifying the existing vegetation conditions and the amount of CO concentration in the study location, 2) to investigate the ability to reduce plants to absorb CO, and 3) to projecting the absorption capacity of vegetation by CO through air prediction models. The research location was conducted at Veteran Selatan, Makassar City, Indonesia. The survey was conducted in Makassar City, Indonesia, as well as data available in the field. The research period from January to April 2020. From the analysis of the results and discussion, the conclusions drawn from this study are: 1) The CO concentration based on the calculation results is 1.186.52 μg / m3. While the CO concentration measured in the field is 2,290.39 μg / m3, so the difference between the calculation and measurement results is 1,103, (48.2%). The number of trees as vegetation, namely 189 trees, had an enormous average volume of cover, namely 2,673.01 m3. 2). The existing plants or vegetation on exsiting location can absorb CO of 1,889.8 tons/year. 3). A balance between CO pollutants and vegetation uptake can be achieved by applying a scenario of planting vegetation for trees, shrubs, and shrubs. Modeling and simulation results show that the total CO emissions will reach 3,184.6 tons/year in the next ten years. However, by applying the planting scenario, the total CO emission in the next ten years will only reach 2,761.9 tons/year, with an average percentage reduction of 8.93%. Keywords: Air Pollution, Pollution Reduction Plant, Absorbing CO, Planting trees, Makassar City 1 Introduction 1 The rapid progress in the transportation sector, especially in urban areas, including the City of Makassar, is evident from the increasing number of vehicles available. This continues to grow from year to year. As the capital city of South Sulawesi Province, Makassar City is the fourth largest city in Indonesia and the largest in the Eastern Region (Murdifin et al., 2018, Suriyanti et al., 2020). The number of motorized vehicles in South Sulawesi increased every year, namely 579,732 units in 2012, 2,352,750 units in 2013, and the number reached 2,615,538 units in 2014, an increase of 6.8% from the previous year. The number of vehicles in Makassar City, both public and private, came around 856 thousand units in 2010 with a growth rate of 12% per year. On several roads in Makassar City, mostly the Veteran Selatan road, traffic problems such as congestion, queues, and delays are everyday things. This generally occurs at certain hours (peak hours), when people want to move for the same purpose and at the same time (Surya et al., 2020; Mallongi et al., 2019). One of the problems mentioned above is caused by an increase in the volume of vehicles every year, which is not followed by an increase in road length or an increase in old roads' capacity. The increase in the number of motorized vehicles impacts reducing air *Corresponding author: Natsir Abduh, Department of Civil Engineering, Faculty of Engineering, Universitas Bosowa. E-mail: n.education100@yahoo.com quality due to emissions from pollutants from fuel combustion. Analysis of BLHD data for South Sulawesi Province in 2013 and 2014 shows that 96.96% uses gasoline, and 3.04% uses diesel fuel in terms of the type of energy used. The dominance of the use of BBM compared to other energy sources has a profound effect on air quality, especially in cities or provincial capitals and in district capitals in South Sulawesi. High traffic volumes cause high pollutant concentrations and vice versa. Common types of pollutants produced from motorized vehicle exhaust are Nitrogen oxide (NOx), Carbon monoxide (CO), Sulfur dioxide (SO2), particles in the form of real particles (TSP), particles with a diameter of 10 microns and 2.5 microns, and below (PM10). And PM2,5), Hydrocarbons (HC), heavy metals, and Ozone (O3). Of these several types of pollutants, carbon monoxide (CO) is one of the most pollutants produced by motorized vehicles (Mayer, 1999; Levy, 2015). The total CO pollutants concentration in the air, 80.22% - 92%, comes from motorized vehicles [7]. Carbon monoxide is a compound that results from incomplete combustion due to a lack of oxygen during combustion due to sub-optimal engine performance. CO pollutants released by motorized vehicles harm human health. Carbon monoxide is a J. Environ. Treat. Tech. ISSN: 2309-1185 Journal web link: http://www.jett.dormaj.com https://doi.org/10.47277/JETT/9(2)434