Expansion of the small oxygen water mass in Tokyo Bay 1999.08.15

According to the results of the 95-year water quality survey of Tokyo Bay, which is summarized by the environmental agency, the proportion of oxygen in the water in the summer months between July and September is less than 3 milligrams per liter, whereas the percentage of hypoxia is almost flat in coastal areas. The total of 24 points, such as the central bay, increased to six points. It is only one point in the 89-year survey, and it shows the pollution expansion to the water water which was comparatively good up to now.