The Chesapeake Bay report card compares 18 indicators (dissolved oxygen, nitrogen, phosphorus, water quality index, chlorophyll a, water clarity, aquatic grasses, benthic community, protected lands, stewardship, social index, walkability, heat vulnerability index, fish community, median income, housing affordability, income inequality, jobs growth) to scientifically derived thresholds or goals. These indicators are combined into an Overall Health Index, which is presented as a subregion percent score. Other indicators (turbidity, blue crab, bay anchovy, striped bass, environmental justice index) presented on these pages are not included in the score.