The main purpose of collecting the data on noise is to find was to identify where and how to reduce it. For example aircraft operators who violate regulations

The main purpose of collecting the data on noise is to find was to identify where and how to reduce it. For example aircraft operators who violate regulations get fined, and highways are targeted for specific modifications to make them more quiet. This is not a zero sum initiative. Given that the data is already being collected, making it available to the public requires relatively little additional effort. The primary value in doing so is to document what measures have been taken, how effective they are, and to motivate public policy decisions about what further measures to take. The same information is useful for private transactions. This is how most people will use the data, but is not the main public policy reason for having collected it.