US lawMassachusettsRegulations105 CMR — Department of Public Health105 CMR 451.00 — Minimum health and sanitation standards and inspection procedures for correctional facilities451.390105 CMR 451.390Noise LevelYear: 2026Length: 25 wordsOfficial source Noise levels should not exceed 70 decibels during the day (7:00 AM to 11:00 PM) and 45 decibels at night (11:01 PM to 6:59 AM).Previous105 CMR 451.384Next105 CMR 451.400