Monitoring marine pollution involves the use of chemical, biological, and physical methods to assess the presence and impact of toxic substances. Technologies such as remote sensing and biomonitoring using indicator species are employed to detect pollutants and evaluate ecosystem health. Management strategies include regulatory policies to limit pollutant discharges, cleanup efforts for oil spills, and public awareness campaigns to reduce plastic waste. International agreements like the MARPOL Convention aim to prevent and minimize pollution from ships globally.