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Chesapeake Bay health edges up to C grade in report card

The University of Maryland Center for Environmental Science on Tuesday gave the health of the nation's largest estuary a C grade for 2020.
Credit: AP
FILE - In this Nov. 19, 2019 file photo, watermen dredge for oysters on the Chesapeake Bay in southern Maryland near Ridge, Md. The health of the Chesapeake Bay is getting a better grade in an annual environmental report card. The University of Maryland Center for Environmental Science on Tuesday, June 22, 2021, gave the health of the nation's largest estuary a C grade for 2020. That's up from a C-minus in 2019. (AP Photo/Brian Witte, File)

The health of the Chesapeake Bay is getting a better grade in an annual environmental report card. 

The University of Maryland Center for Environmental Science on Tuesday gave the health of the nation's largest estuary a C grade for 2020.

That's up from a C-minus in 2019. Individual indicators of bay health had mixed results in 2020, but the report says the overall bay-wide trend continues to improve. 

The report says seven out of 15 regions showed significantly improving health trends. 

Dissolved oxygen and total nitrogen scores improved, while chlorophyll a and total phosphorus scores declined.