Abstract
In yokkaichi, pollution preventing facilities were fully installed in 1970s, and the initial investment costs may be large about 100 billion yen or more. And then, the atmospheric environment can be maintained under 0.01 ppm of SOx concentration in entire Yokkaichi area to the healthy condition. Above these facts obtained in Yokkaichi indicate that the minimizing total investment plus compensation costs was not an adequate solution. When saying in other words, surplus investment was done for the air pollution prevention in Yokkaichi Area. We successfully demonstrate the simplified relation between annual averaged SO_2 concentration value in ppm and the total environmental investment costs based on the experience of Yokkaichi in the past.
