Portsmouth, NH Noise Levels
Is Portsmouth, NH noisy?
Portsmouth, NH sits below the 45 dB(A) floor BTS's transportation noise model measures at all, road, rail and aircraft alike. Portsmouth's reading comes from a single sampled point, not a block-by-block sweep, so a specific address here could genuinely differ.
Where Portsmouth ranks
Portsmouth is one of 8,515 places in this dataset with no measurable transportation noise at all, too quiet to rank on loudness. By population, it ranks 1,725 of the 12,137 places in this dataset, home to about 22,938 people.
Your street may differ from Portsmouth's reading
This page describes Portsmouth as a whole. If one specific address is what matters, BTS publishes the same underlying map for free.
Behind Portsmouth's reading
The methodology guide shows exactly how Portsmouth's reading was built from BTS's tile data. Portsmouth isn't the only surprise: the guide to why big cities show up quiet covers why this happens.