If prospective buyers could spend a week in a house they're thinking about buying, it would give them a good feel for the neighborhood, including how noisy (or quiet). Now there's a tool that can help with that. Enter the address at HowLoud and you'll get a SoundScore – a 50 to 100 rating (higher is quieter) on the ambient noise level. While it won't tell you about the neighbor who leaves for work at 5:00 AM on his Harley, it will give you a look into noise produced by trains, airplanes, traffic, commercial sites and the like. If this "takes off" it will become similar to a WalkScore as one independent tool to evaluate a neighborhood.