Divers in the Philippines have described finding coral reefs littered with single-use face masks, also known as Personal Protective Equipment (PPE).
In keeping with an estimate by the Asian Development Bank, since the beginning of the Covid-19 pandemic, the city has been producing an additional 280 tonnes of medical waste per day, reports BBC.
Environmental groups are warning that the plastic inside face masks is breaking down and being consumed by marine wildlife.
They're urging the Philippine government to enhance its dealing with medical waste, to prevent additional pollution of the seas.
The BBC's Howard Johnson joined divers from Anilao Scuba Dive Centre, a group affiliated to the United Nations Environment Programme's Green Fins, which promotes sustainable marine tourism in South East Asia.