| Subject | English | Croatian |
| environ. | biochemical oxygen demand | biološka potražnja kisika |
| environ. | chemical oxygen demand | kemijska potreba za kisikom |
| environ. | dissolved oxygen | otopljeni kisik |
| environ. | oxygen content Amount of oxygen contained in a solution | sadržaj kisika (Količina kisika u otopini) |
| environ. | oxygen deficiency No definition needed | pomanjkanje kisika |
| environ. | oxygen deficiency No definition needed | nedostatak kisika |