Abstract
We evaluate nitrogen oxides pollution in Takamatsu and Utazu area in Kagawa prefecture, Japan. Annually observations for nitrogen oxides (nitrogen dioxide; NO2, nitric oxide; NO) (1990-2007) were obtained from data base of Kagawa prefecture, Japan. Changes in NO2 and NO in Takamatsu and Utazu area were evaluated and compared. In 2007, NO2, NO and NO2 + NO (ppm) in Takamatsu area were higher than those in Utazu area. However, NO2 /NO + NO2 in Takamatsu area was lower than that in Utazu area. From 1990 to 2007, mean of NO2 in a day over the level of 0.06 ppm was 30 days in Takamatsu area and only one day in Utazu area. Mean of NO2, NO and NO2 + NO was significantly higher and NO2/NO + NO2 was lower in Takamatsu area than that in Utazu area. In addition, NO2, NO and NO2 + NO were negatively correlated and NO2/NO + NO2 was positively correlated with years (1990-2007) in Takamatsu area. The level of nitrogen oxides pollution in Utazu area was lower than Takamatsu area. Further observation is required for preventing nitrogen oxides pollution in Kagawa prefecture, Japan.
Highlights
Air pollution is one of the public health challenges in Japan
We firstly evaluated and compared nitrogen oxides pollution in Takamatsu and Utazu area, Kagawa prefecture, Japan, which located around the Inland Sea, Japan
Japanese Environmental Quality Standards (JEQS) [2] of NO2 were recommended that mean value of NO2 in a day was under the level of 0.06 ppm and NO2 value in Japan were almost under the level of 0.06 ppm [7]
Summary
Air pollution is one of the public health challenges in Japan. Air pollution occurs where the natural composition of the atmosphere is altered significantly in a way that is perceived as being harmful. In Japan, environmental air quality has changed remarkably since the 1960s. A serious environmental pollution problem caused by the enormous emission of pollutants from industries has been improved and controlled. Another type of air pollution related to automobile exhaust in large cities has become a great problem. Atmospheric Environmental Regional Observation System [1] in Ministry of the Environment monitor air pollutants, and their concentrations have not sufficiently achieved Japanese Environmental Quality Standards (JEQS) [2]. In Kagawa prefecture, Japan, air pollution has been observed in some observation points [3]
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