When Japan's Basic Act on Environmental Pollution Control was amended in 1970, soil contamination was added as a fourth category of environmental quality standards.
Sources
- Compendium of Reference Materials on the Basis for Establishment of Environmental Quality Standards in Japan (nies.go.jp)
- https://ousar.lib.okayama-u.ac.jp/files/public/2/20512/20160528012037849001/erc_016_025_028.pdf (ousar.lib.okayama-u.ac.jp)
- https://link.springer.com/chapter/10.1007/978-3-031-40609-6_9 (link.springer.com)
- https://kotobank.jp/word/%E7%92%B0%E5%A2%83%E5%9F%BA%E6%BA%96-48595 (kotobank.jp)
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