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In this section, you will learn about noise, including:

In addition, you will learn about

Finally, this section will discuss models and metrics used to measure noise and the impact of weather on aviation operations.

First and foremost, it is important to understand what is noise. This is discussed inthe following section.

What is Noise?


Noise can be defined as any unwanted sound. What sounds annoy you may or may not annoy someone else. In addition, what sounds annoy you can vary, depending on the situation.

Here are some things that affect your level of annoyance:

Many variables influence people's perception of noise. However, since the level of annoyance changes from person to person, it is difficult to determine what is too noisy or annoying for an entire community. This extremely complex human response to noise makes noise impact assessment a challenging task.



What are supplemental noise metrics?

To analyze the impacts of aviation noise, the Federal Aviation Administration (FAA) uses the Day-Night Average Sound Level (DNL) as the primary metric for quantifying individuals' cumulative exposure to aircraft noise. Noise impact analysis around airports can be supplemented by computing other metrics, referred to as "supplemental", to provide more information about noise from aircraft operations. These type of metrics used to measure noise depends on the community and their activity.

Click here for more information on FAA policies and procedures regarding environmental analysis supplemental noise analysis.

Supplemental metrics include:

These metrics are computed in existing aircraft noise computer programs.

Another metric used in supplemental noise analysis but not computed in existing aircraft noise computer programs is

Which supplemental noise metrics are commonly used?