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Scientists give Chesapeake Bay its highest environmental grade since 1992

Scientists give Chesapeake Bay its highest environmental grade since 1992

The Chesapeake Bay received a "C" on its latest report card, released Tuesday, its highest score since 1992.

In an annual survey of bay conditions, researchers at the University of Maryland Center for Environmental Science found that water clarity and the prevalence of underwater grasses increased over the past year, while levels of nitrogen pollution fell.

Ecosystems in the upper Chesapeake, north of the Bay Bridge, showed significant improvement, though conditions in the Patapsco and Back rivers in and around Baltimore remain poor, the survey found.

Scientists say the data shows that efforts to reduce the pollution flowing into the estuary are...

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