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Abstract

The study aims to analyze the diurnal variation of the concentration of ozone (O3) and its precursors, carbon monoxide (CO) and nitrogen dioxide (NO2) in ambient air, as well as its relationship with the temperature, solar radiation and characteristics of traffic on the roadside area in Padang. O3 and its precursors sampling were carried out on three roads of Padang, which is classified according to its function, Ganting road representing local roads, Bagindo Aziz Chan road representing collector roads and Khatib Sulaiman road representing arterial roads. The results showed the highest concentrations measured in the Khatib Sulaiman road with the highest O3 concentrations occurred at 13:00 to 14:00 at 141.56 µg/m3, while the highest concentration of CO and NO2 occurred at 17:00 to 18:00 at 915.34 µg/m3 and 106, 13 µg/m3. The increase of solar radiation and the surface temperature is directly proportional to increasing concentrations of O3 and inversely proportional to the concentration of CO and NO2. Increased volume and traffic density is directly proportional to increasing concentrations of O3, CO and NO2, while traffic speed is inversely proportional to the concentration of O3, CO and NO2. However, the relationship between the traffic speed with NO2 concentrations tend to be weak and insignificant.