How many hours per day can you be exposed to a noise level of 110 dB?

How many hours per day can you be exposed to a noise level of 110 dB?

• A. Half an hour
• B. One hour
• C. Two hours
• D. Fifteen minutes

Answer: (A)

Exposure limits for noise follow a fixed rule: as the sound level increases, the safe time of exposure decreases in steps. OSHA uses a 5 dB exchange rate, with a baseline of 90 dB allowed for 8 hours. Doubling the allowed duration isn’t what happens here; instead, every 5 dB rise cuts the permissible time roughly in half. Starting from 90 dB for 8 hours, move up in 5 dB steps: - 95 dB: 4 hours - 100 dB: 2 hours - 105 dB: 1 hour - 110 dB: 0.5 hours So at 110 dB, the safe exposure time is 30 minutes. If you need longer exposure, you’d rely on hearing protection or reduce the time spent in that level.

Exposure limits for noise follow a fixed rule: as the sound level increases, the safe time of exposure decreases in steps. OSHA uses a 5 dB exchange rate, with a baseline of 90 dB allowed for 8 hours. Doubling the allowed duration isn’t what happens here; instead, every 5 dB rise cuts the permissible time roughly in half.

Starting from 90 dB for 8 hours, move up in 5 dB steps:

• 95 dB: 4 hours

• 100 dB: 2 hours

• 105 dB: 1 hour

• 110 dB: 0.5 hours

So at 110 dB, the safe exposure time is 30 minutes. If you need longer exposure, you’d rely on hearing protection or reduce the time spent in that level.