Each fighter wing location has varying levels of existing noise, depending on the airfield configuration and the other aircraft that operate there (both military and civilian). Noise contour maps show a projection of the noise environment, using standard metrics required by the Department of Defense, Federal Aviation Administration, and U.S. Environmental Protection Agency. For California, that standard metric is the Community Noise Equivalent Level (CNEL), and for Massachusetts and Louisiana, that standard metric is the Day-Night Average Sound Level (DNL). Both CNEL and DNL account for all the aircraft noise produced from all the aircraft operations for a full year.