4.4 Water pollution
4.4.2—Plastic debris accumulation
4.4.3—Water quality measurement
4.4.4—Biochemical oxygen demand (BOD)
4.4.5—Eutrophication
4.4.6—Eutrophication sequence
4.4.7—Eutrophication and ecosystem services
4.4.8—Eutrophication management levels
4.4.9 (HL)—Water pollutants
4.4.10 (HL)—Harmful algal blooms
4.4.11 (HL)—Anoxic and hypoxic waters
4.4.12 (HL)—Sewage treatment stages
4.4.13 (HL)—Indicator species
4.4.14 (HL)—Biotic index
4.4.15 (HL)—Water Quality Index (WQI)
4.4.16 (HL)—Water quality guidelines
4.4.17 (HL)—Citizen action
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