Investigation of carbon monoxide (CO) concentrations on roads in the city of Makassar

Abstract

Abstract Air pollution has long been and is still a problem for humans and the environment, a priority in countries with high vehicle rates. The contribution of gas released reaches 60-70%. Motor vehicles produce one of the pollutants, namely Carbon Monoxide (CO) gas. This research was conducted to determine the level of CO concentration results from sampling using impinger and prediction models using Caline4 software. The results of the concentration between direct measurements with the Caline4 model were then compared. This research was conducted in three streets for three working days namely Jl.Urip Sumoharjo, Jl.Talasalapang, and Jl.Nusantara. The methodology used is direct measurement using impinger, calculating vehicle volume at each measurement point, and analyzing CO concentrations using Caline4. The results of sampling showed the highest CO concentration on Jl.Urip Sumoharjo at 5.80 ppm, Jl.Talasalapang at 1.06 ppm, and Jl.Nusantara 1.15 ppm. The highest estimation results of CO concentrations with Caline4 on Jl.Urip Sumoharjo were 5.7 ppm, Jl.Talasalapang by 1.1 ppm, and Jl. Nusantara was 1.4 ppm. High or low CO concentration value depends on vehicles volume, for instance, CO concentration increases with increasing vehicles volume. In addition, it is also depends on the meteorological factor, such as, the faster the wind increases, the faster the pollutants will increase. Then compare the results of CO impinger concentration and Caline4 using the t-Test to see the difference of the two CO concentrations. Comparisons were made using the t-Test to meet the t-stat < t-critical concluded that there was no significant difference between the two CO concentrations.