....I think what the OP asks is rhetorical (only to prompt the readers to consider a point of view: noise is everywhere; little can be done to escape it).
Specific software (and expert analysts) exist to answer these questions for the FAA, real estate developers, highway builders, railroads, industrial and urban planners: mapping "noise" using GIS systems to generate noise prediction maps.
I've read that the FAA is now implementing a new system called RNAV, to channel air traffic into "tight noise corridors", or, what opponents call, "air traffic noise superhighways". The system will not eliminate "landing and take-off tracks" (look at Google Earth before you select a camping locale, and make sure you are at least 10 miles away from where the runways point!), however, after the aircraft exits these tracks (that never change), it is the splaying-off of the aircraft that will be better channeled (ie, the aircraft won't be splaying off after take-off in all directions, but will be kind of more optimally channeled than ever before to optimize for fuel, noise and time to destination).
Now, road and traffic noise: these are persistent, and 24 hours a day (varying in amplitude during rush hours and holidays and routing). Traffic noise literally blankets the entire urban terrain (almost impossible to escape it!). Traffic noise is probably the most insidious of urban noise pollution. Sometimes, mountain ranges and canyons can channel it or deflect it...it depends on source. You want to position yourself at least 3 miles from an interstate and busy secondary and tertiary roads (study where they are on Google Earth, and considering the civilian and military runways in the area, plot the optimum camp location, and eliminate all the crappy locales).
The last big one is people noise pollution: loud radios, young kids playing, family-aged people going to work (at seemingly all hours of the day/night), and uncontrolled noise in your neighborhood (a neighborhood could be your HOA community, a campground, a State or National Park, an ocean-front campground, a boondocking locale, etc). Generally: the most tightly controlled campgrounds are very expensive "resorts" that are STRICTLY 55 years old + membership. These vary in "strictness". Then, there are the absolutely IDEAL locales: boondocking BLM sites (and National Forests) that are FAR away from traffic and human density, but offer NOTHING in the way of amenities (no water, no electricity, no sewer, nada). There are good and bad BLM sites: some are playgrounds for lots of folks with ATV vehicles and dirt bikes (extremely noisy); there are some BLM sites with none of these vehicles allowed.
Anyhow, you have your work cut out for you! Can you imagine how valuable a noise pollution map with every campground waypoint in and Municipal, State and National Park boundary, and BLM boondocking camping polygon in America positioned as a layer would be ?? I thought about producing such a "noise pollution" analysis, and selling it to the GPS manufacturers at one time.
Good luck in your search for a reduced noise locale to snowbird at!
On edit: if you find such an animal....don't tell anyone where it's at :B
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