ODS are primarily chlorofluorocarbons formerly used in which ship systems?

• A. Fire-fighting and refrigeration systems
• B. Fuel oil systems
• C. Ballast water systems
• D. Paint storage

Answer: (A)

ODS are ozone-depleting substances that were used on ships mainly in two areas: fixed fire-fighting systems and refrigeration/air-conditioning systems. Halons provided fast, residue-free fire suppression in enclosed spaces, while chlorofluorocarbon refrigerants were common in shipboard cooling systems. Because these substances harm the ozone layer, their use has been phased out and replaced with safer alternatives. The other options—fuel oil systems, ballast water systems, and paint storage—do not center on ODS use.