Abstract
A few studies have reported the concentrations of nitrate and sulfate because the continuous measurements of both substances are not typically easy. Since we could use continuous analyzers, we surveyed the concentrations of nitrate and sulfate for almost a year in Uji, Kyoto Prefecture , and then analyzed the seasonal variation and diurnal variation of the concentrations. The concentrations of PM particles(PM1, PM2.5, PM10)were low in the winter. The concentrations of nitrate in the PM1 and PM10 decreased in the summer. In contrast, the concentrations of sulfate increased in the spring. It is considered that these concentration variations are influenced by the gasification of nitrate in the summer and blowing of yellow sand in the spring. The peak time of the nitrate concentrations was typically observed between 8 a. m. and 9 a. m. in the diurnal variation in relation to the increased concentration by increased traffic volume and decreased concentration by a warmer temperature. In addition, the peak time of the sulfate concentrations was observed about 2 p. m. when the amount of UV increased. By comparing the concentrations among the main wind directions, both the concentrations of nitrate and sulfate were appreciated to be found by the wind from the direction of Osaka City.
