Marion, IA Noise Levels
How loud is Marion, IA?
None of the three transportation sources BTS models, road, rail or aircraft, register above 45 dB(A) at Marion, IA. That's the reading at Marion's Census-defined center point, not any one street, BTS's map is a live raster, not a per-address service.
How Marion compares nationally
Marion, IA sits among 8,515 US places this dataset covers with no measurable transportation noise, out of 12,137 places checked overall. About 42,542 people live there, making it the 974th largest place in this dataset.
Checking one address in Marion
Nothing here substitutes for checking one address in Marion directly, and BTS's own map lets anyone do that at no cost.
Marion's number isn't a one-off calculation, it comes from the same method covered in the methodology guide. See the why New York City shows up quiet here too for why a real place can show no reading at all.