Health Hazard Evaluation Report HETA 84-493-1583; General Services Administration Washington, D.C. [open pdf - 2MB]
"In August, 1984, the National Institute for Occupational Safety and Health (NIOSH) received a request for a Health Hazard Evaluation from the General Services Administration (GSA) to conduct an evaluation of siren noise in ambulances. GSA requested that NIOSH quantify the noise levels relative to siren location prior to completing a proposed revision of the Federal Specification for emergency medical care vehicles (ambulances). [...] A potential hazard was found to exist from ambulance siren noise. Substantial reductions in noise levels (10-22 dBA) were achieved when siren speakers were located in the ambulance grille area. When windows were also kept closed, patient and driver compartment noise levels were 76-80 dBA, the potential hazard of noise-induced hearing loss was eliminated and communicative ability vastly improved. Recommendations to eliminate the potential health and safety hazard are provided in Section VII of the report."
HETA # 84-493-1583; Health Evaluation and Technical Assistance Report Number 84-493-1583
Centers for Disease Control and Prevention: https://www.cdc.gov/