What is the daily method used to calculate DNL measurements?

The daily method used to calculate Day-Night Average Sound Level (DNL) measurements provides a comprehensive understanding of noise exposure over a typical day. This method averages noise levels over a full 24-hour period, allowing for fluctuations in noise to be captured and assessed accurately.

By averaging the sound levels throughout an entire day, including peak and non-peak hours, DNL provides a consistent indicator of the noise environment experienced by individuals living near airports or other noise sources. This metric takes into account not just the intensity of noise, but also its duration, thereby offering a greater context regarding its potential impact on the community.

Choosing to average over a 24-hour period rather than focusing on specific hours, weekly averages, or annual noise levels ensures that the calculated DNL reflects the true daily experience of noise exposure. This is critical for effective noise management and for addressing community concerns regarding aviation and other sources of noise.