When the air temperature is less than or equal to 19oC, the ground ozone concentration over Kigali is directly proportional to solar radiation; however, when the air temperature exceeds this range, the ozone concentration begins to decrease, but R2 is very low, implying that this is a very unlikely scenario. For wind speeds between 2 and 2.81 m/s, ambient ozone concentration is inversely related to solar radiation, but for wind speeds above 2.81 m/s, ambient ozone increases as solar radiation increases. The ambient ozone concentration rises as atmospheric relative humidity rises when the wind speed is between 2 and 2.81 m/s, but when the wind speed is larger than 2.81 m/s, the ambient ozone concentration declines as atmospheric relative humidity rises. The average wind speed reported was 3.7402 m/s with a quiet status of 0%. With maximum wind speeds of 6–7.62 m/s, the major wind direction was west-south with a frequency of 31%, followed by southeast and southwest with a frequency of 22%. As a result, if a pollutant source exists in the west, southwest, southeast, south, or east, it may be primarily disseminated in the north, northwest, or northeast from July to September 2020. Wind speed was 4.3217 m/s at the lower lever of 10.3ppb to 20.2ppb, with a prominent direction of westerly, westsouth, southeast, and a frequency of around 18%, 30%. Ambient ozone was delivered from a number of directions for values more than 20.2 ppb, including west, southwest, south, southeast, and east, with maximum wind speeds ranging from 6 to 7.62 m/s.
Author (S) Details
J. D. Ndayisenga
Department of Physics, College of Science and Technology, University of Rwanda, Kigali, Rwanda.
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