MODEL RELEASED. Coal mine. Technician measures the noise levels produced by machinery at a coal face in a mine. The mine workers are wearing ear defenders to protect their hearing from the noise. Temporary or permanent hearing loss can occur after exposure to high levels of noise. Photographed during research conducted by the Health and Safety Laboratory in Britain. CROWN COPYRIGHT UNDER LICENCE FROM THE HEALTH & SAFETY LABORATORY & CONTROLLER OF HER MAJESTYS STATIONERY OFFICE
