Which weighting scale is most frequently used in noise impact assessments to simulate human hearing response?

The A-weighting scale is the weighting scale most frequently used in noise impact assessments to simulate human hearing response. The A-weighting scale is a standardized frequency weighting that adjusts sound pressure levels to reflect the varying sensitivity of the human ear to different frequencies. Human hearing is less sensitive to low-frequency and very high-frequency sounds, and the A-weighting scale attenuates these frequencies to better represent how humans perceive loudness. Noise levels measured using the A-weighting scale are expressed in dBA (A-weighted decibels). This weighting is used because it provides a better correlation with subjective human perception of noise than unweighted measurements. For example, a noise source may have a high sound pressure level at low frequencies, but if it is A-weighted, its perceived loudness will be lower because the A-weighting scale reduces the contribution of those low frequencies. This makes A-weighted measurements more relevant for assessing the potential impact of noise on human health and well-being.