四よん大だい公こう害がい病びょうよんだいこうがいびょうMeanings1nounfour major pollution diseases of JapanRefers to Minamata disease, Niigata Minamata disease, Yokkaichi asthma, and Itai-itai disease. A historical term used in environmental and legal contexts.See also: 水俣病 · 第二水俣病 · 四日市喘息 · イタイイタイ病四よん大だい公