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Ground level ozone (O 3 ) is the most significant secondary air pollutants in Malaysia, and this air pollutant exhibited different variations during daytime and nighttime due to differences in photochemistry. This utilizing seven variables (O 3 , NO 2 , NO, SO 2 , PM 10 , temperature, and relative humidity) secondary data acquired from the Air Pollution Division, Department of Environment Malaysia. The nighttime data (7 p.m. – 6 p.m.) on March and December 2015 were used to represent the dry and wet months, respectively. Box and whisker plots were used to show the variation of nighttime O 3 , NO 2 , NO, SO 2 , PM 10 , temperature, and relative humidity during the dry and wet months. Results suggested that there are variations among the selected variables between dry and wet month with temperature, O 3 , NO 2 , and PM 10  showed higher value during dry month compared to wet month. Meanwhile, relative humidity, NO, and SO 2  showed the opposite result.

Assessment of Nighttime Ground Level Ozone Concentration in Klang During Wet and Dry Month