- 著者
-
大平 俊男
- 出版者
- Japan Society for Atmospheric Environment
- 雑誌
- 大気汚染研究 (ISSN:21863687)
- 巻号頁・発行日
- vol.12, no.7, pp.425-430, 1977
In an attemt to clarify air pollution conditions in the atmosphere over the southern Kanto area, the Tokyo Metropolitan Research Institute for Environmental Protection, using an aircraft, made a survey of the concentration of NO<SUB>x</SUB>, SO<SUB>2</SUB>, TSP, CH<SUB>4</SUB>, non CH<SUB>4</SUB>·HC and CO in the layer between the altitudes of 700 and 1, 800 meter in October, 1974. The results are as follows:<BR>(1) The average concentrations of NO and NO<SUB>2</SUB> were 0.24 pphm and 0.92 pphm respectively, the latter being about 1/3 to 1/5 of that on the ground.<BR>(2) No SO<SUB>2</SUB> was detected in most of the days, except on October 18 when its average concentration was 1.4 ppb, being approximately 1/10 of the ground concentration.<BR>(3) TSP average concentration measured by light scattering method was 1.6μg/m<SUP>3</SUP> over Takyo and 11μg/m<SUP>3</SUP> in the upper air of Sagami Bay. These were around 1/60 to 1/10 of the ground level concentsation in Tokyo. SO<SUB>4</SUB><SUP>--</SUP> and NO<SUB>3</SUB><SUP>-</SUP> concentration in the dust by high volume sampler were from not detectable value to 29 μg/m<SUP>3</SUP> and from 1 to 23 μg/m<SUP>3</SUP> respectively, both being a little lower than the surface values in Tokyo, but the differences did not seem to be great compared with other pollutants.<BR>(4) The concentration of CH<SUB>4</SUB> was about the same as that of surface level, ranging from 1.5 to 1.7 ppmC, while that of nonCH<SUB>4</SUB>·HC was mostly between 0.2 and 0.4 ppmC, being about 1/2 of the ground concentrations.<BR>(5) CO value was mostly 0.4 through 0.8 ppm, about 1/5 of the ground concentration.<BR>Recently, Dr. T. Kitagawa made a hypothesis that photochemical smog was produced by aircraft exhaust gas accumulated in an inversion layer, not by autmobile and factory exhaust gas. This hypothesis, however, not only raises doubt in several points, but also can not be supported at least in the light of the conditions of air pollutants in the layer between 700 and 1, 800 meter above the ground, especially of the measurements of precusors of photochemical smog such as NO<SUB>x</SUB> and nonCH<SUB>4</SUB>·HC.