With the start of regulation* of sulphur oxides (Sox) and particulate matter (PM) under Regulation 14 of Annex VI of MARPOL Convention in 2020, exhaust gas purification equipment is required when C heavy oil is used as fuel oil for ships. The quality of the water discharged from this system to the outside of the ship is also mandatory to be measured. HORIBA contributes to environmental regulations and to protecting the global environment through its lineup of water quality measurements and a wide range of meters. * Since air pollutants (Sox, PM, etc.) cause health hazards such as respiratory diseases, regulations on land emission sources and mobile emission sources are implemented independently in each country. Emissions from vessels are regulated by the International Maritime Organization (IMO) in the International Convention on the Prevention of Pollution from the Sea (MALPOL) worldwide, whether on ocean or on coastal voyages.