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This study aims to analyze and map the concentration of ozone gas in ambient air in Padang City. The study was conducted by taking samples of ozone gas at 52 points in Padang City for one hour of measurement. Ozone concentration was analyzed by NBKI method using a spectrophotometer. From the results obtained, the concentration of ozone gas at Padang City varied between 6.32 and 87.06μg/Nm3 at an average...