ICETT Let's learn about Yokkaichi Pollution Outline of Japan's Industrial Pollution Abatement Approaches to Water Pollution Control (Case Study-2) Minamata City, Kumamoto Prefecture (1) Conditions and 7tends of Methylmercury Compound Pollution Figure 3 - 4 Figure 3 - 4 Figure 3-4 Changes in Acetaldehyde Production, Mercury Discharge, and Minamata Disease Cases