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Modeling CO Dispersion from Motor Vehicle Emission Sources in Makassar City a) Environmental Engineering, Faculty of Engineering, Hasanuddin University Abstract This study aimed to analyze the concentration levels, emission loads, and dispersion patterns of carbon monoxide (CO) in ambient air from linear transportation sources in Makassar City. Traffic volume data were collected every 15 minutes using a traffic counter for motorcycles (MC), light vehicles (LV), and heavy vehicles (HV). The analysis of the concentration values of pollutant parameters CO was carried out in the Water Quality laboratory, Department of Environmental Engineering, Faculty of Engineering, Hasanuddin University. The approach of this research is quantitative descriptive, namely comparing the concentration value of the results of the analysis of air parameters with the applicable quality standards. Emission loads were calculated using the Tier 2 method according to vehicle categories in Ministry of Environment Regulation No. 12 of 2010. The AERMOD dispersion model was used to simulate CO distribution from emission sources. The measured CO concentrations ranged from 229 micrograms/m^3 to 1,664 micrograms/m^3, while modeled concentrations ranged from 275 micrograms/m^3 to 1,320 micrograms/m^3. Emission loads varied from 0,01 to 35,53 grams/second. The dispersion pattern followed the prevailing wind direction, which was predominantly toward the northwest. Based on measurement data, CO concentrations in Makassar remained within the national ambient air quality standards set by Government Regulation No. 22 of 2021. The results showed that the combination of field measurements and dispersion modeling provided a reliable approach to assess the impact of transportation emissions on urban air quality and can serve as a reference for air pollution control strategies. Keywords: Carbon Monoxide (CO), Motor Vehicle Emissions, Dispersion, AERMOD Topic: Physics and Physics Education |
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