In 2007, a total of 230 species found in Palau were listed on the International Union for Conservation of Nature and Natural Resource (IUCN) Red List as vulnerable to some degree including 53 species listed as near threatened, vulnerable, or endangered 64 species listed as data deficient.
Koror and Airai have the highest populations in Palau with more development (roads, residential development and
industry). By comparison, Kayangel and Ngarchelong have small populations and very limited pollution. Loss of fish
catch from terrestrial pollution for Hatohobei and Sonsorol, two states with minimal population and negligible development, is assumed to be zero, and they are not included in the estimates.
Annual consumption of ozone-depleting substances (ODS). ODS consumption is measured units of ODS tonnes, which is the amount of ODS consumed, multiplied by their respective ozone depleting potential value.