Marion, IL Noise Levels
Is Marion, IL noisy?
Marion, IL reads 47.5 dB(A) on BTS's 24-hour average, 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. 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.
Marion's noise, by source
Each of the three transportation modes gets its own model from BTS; the combined figure above is what they add up to.
Where Marion ranks
Among the 3,622 US places in this dataset with any measurable transportation noise, Marion ranks 2,172, loudest first. Population is about 17,021, 2,194th largest of the 12,137 places covered here.
Your street may differ from Marion's reading
This page describes Marion as a whole. If one specific address is what matters, BTS publishes the same underlying map for free.
Behind Marion's reading
The methodology guide shows exactly how Marion's reading was built from BTS's tile data. Marion isn't the only surprise: the guide to why big cities show up quiet covers why this happens.