 A hazy, hot, and humid day did not mean a beach day at all the state beaches. About two dozen public beaches, lakes, and ponds remain off-limits. State health officials say no swimming, mostly due to high levels of bacteria in the water. Among the beaches shut down include Constitution, Malibu, and Tennion beaches in Boston. Kings Beach in Lynn and Wollaston in Quincy also closed. The beach at Walden Pond in Concord is also off-limits. It's underwater, a leftover from heavy rains this past spring. The state updates its water quality report on its database twice a day.