The Four Big Pollution Diseases of Japan (四大公害病 yondai kōgai-byō) were a group of manmade diseases all caused by environmental pollution due to improper handling of industrial wastes by Japanese corporations. Although some cases of these diseases occurred as early as 1912, most occurred in the 1950s, 1960s, and 1970s.
Due to lawsuits, publicity, and other actions against the corporations responsible for the pollution, as well as the creation of the Environmental Agency in 1971, increased public awareness, and changes in the practices of the responsible companies, the incidence of these diseases declined after the 1970s.
See also 
- ^ Almeida, P and Stearns, L (1998). "Political opportunities and local grassroots environmental movement: The case of Minamata". Social Problems 45 (1): 37–60. doi:10.1525/sp.1998.45.1.03x0156z.