According to WHO regulations, what is the standard of daytime noise in wards?

According to WHO regulations, the standard of daytime noise in wards is 35-40 decibels. When the noise intensity is 50-60dB, it will cause considerable interference. Long-term exposure to noise above 90dB will cause headache, dizziness, tinnitus, insomnia and other symptoms. Noise reaching or exceeding 120dB may cause hearing loss.