Which metric is used to express peak exposure in the pregnancy noise guidelines?

Which metric is used to express peak exposure in the pregnancy noise guidelines?

• A. Leq
• B. Lmax
• C. SEL
• D. SPL

Answer: (B)

Peak exposure is about the highest instantaneous sound level reached during a period. Lmax captures that exact value—the maximum level observed in the measurement interval—so it directly expresses peak exposure. Leq reflects the average energy over time, smoothing out spikes, which is not about the loudest moment. SEL accounts for the total energy of a sound event and is normalized to duration, again focusing on overall exposure rather than a single peak. SPL is a general term for sound pressure level and doesn’t specify a peak value unless paired with a peak metric like Lmax. Therefore, Lmax is the best choice for expressing peak exposure in pregnancy noise guidelines.

Peak exposure is about the highest instantaneous sound level reached during a period. Lmax captures that exact value—the maximum level observed in the measurement interval—so it directly expresses peak exposure. Leq reflects the average energy over time, smoothing out spikes, which is not about the loudest moment. SEL accounts for the total energy of a sound event and is normalized to duration, again focusing on overall exposure rather than a single peak. SPL is a general term for sound pressure level and doesn’t specify a peak value unless paired with a peak metric like Lmax. Therefore, Lmax is the best choice for expressing peak exposure in pregnancy noise guidelines.