On September 1997, the Conference of Parties to the International Convention for the Prevention of Pollution from Ships adopted the Technical Code on Control of Emission of Nitrogen Oxides from Marine Diesel Engines. The purpose of this Code is to specify the requirements for the testing, survey and certification of marine diesel engines to ensure they comply with NO{sub}x limits. This paper describes the proposal for amend ments to NO{sub}x Code on test condition fa submitted by Japan, the research conducted by the authors on "Follow-up Survey on NO{sub}x Concentration from Cogeneration Engines", and the countermeasures of 4 stroke medium speed diesel engine for IMO regulation on NOx.
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