As far as agriculture is concerned, the night soil which used to be disposed into rivers were not much of a problem earlier, but became a threat after the introduction of chemical fertilizers and such. Eventually, the effects of pollution became evident and the people of Japan, who had moved to the cities, began to see the effects of pollution. The development in waste pollution treatment, including the sewerage facilities has always been slow until recent years. Now people have realized the importance of waste pollution treatment. In the past, Japan has suffered considerable loss as a result of waste pollution, including copper poisoning and cadmium poisoning through water sources, Sulphur di-oxide and Nitrogen di-oxide pollution through air.
Another important form of poisoning that affected the people was arsenic poisoning which was caused by the arsenic dust from the mines, causing breathing illnesses such as asthma and bronchitis. With the increase in the number of waste pollution issues, the government decided to make some drastic changes, making strict efforts to curb pollution.