SALISBURY, MD (AP) – Researchers say the Chesapeake Bay’s infamous dead zone is the smallest it’s been in years. The so-called dead zone is an area where oxygen levels are so low that aquatic life dies. The area is caused by pollution and runoff from farms and cities in the bay’s watershed. The dead zone is smaller in both the Maryland and Virginia sides of the bay. Beth McGee, Director of Science at the Chesapeake Bay Foundation, said the smaller dead zone is proof that cleanup efforts are working.