Bay 2021 Dead Zone Test Results

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The Chesapeake Bay Program has reported on the Bay’s 2021 “dead zone,” that area in which there is little or no oxygen and plant and marine life is unable to exist. The dead zone is created by nitrogen, phosphorus, and other pollutants flowing into the Bay from adjacent lands, rivers, and streams. A dead zone is created in the Bay every summer. It’s size and duration is influenced by temperature and rainfall. Overall, the duration of the 2021 dead zone was 89% longer than those recorded over the past 36 years and remained above average in size. For more information on the results and how you can help, visit