Indianapolis, IN Noise Levels
How loud is Indianapolis, IN?
At 47.5 dB(A), Indianapolis, IN falls inside HUD's "Acceptable" noise zone, 65 dB(A) day-night average or below under 24 CFR 51.104, the federal government's own line for building housing with no extra sound attenuation required. The main source is road traffic, well ahead of the other two modes BTS tracks. This describes Indianapolis as a whole, not a specific block, the underlying BTS map resolves to about 38 meters per pixel, sampled at the town's own center point.
Where Indianapolis's noise comes from
BTS models these three sources separately before combining them, so a place can be quiet on two and loud on the third.
If you're weighing a move to Indianapolis
Upgraded windows, door seals and STC-rated glazing meaningfully cut broadband, near-continuous road noise.
How Indianapolis compares nationally
Indianapolis ranks 1,776 of 3,622 measured places nationally, 1 being the loudest this dataset covers. By population, it ranks 18 of the 12,137 places in this dataset, home to about 891,484 people.
Checking one address in Indianapolis
Nothing here substitutes for checking one address in Indianapolis directly, and BTS's own map lets anyone do that at no cost.
Indianapolis's number isn't a one-off calculation, it comes from the same method covered in the methodology guide. The guide to what actually cuts each kind of noise explains why road traffic calls for a different fix than the other two sources.