This map shows modeled outdoor noise across Rockville at 100-meter resolution, combining road, aviation, and rail sources. Green areas measure below 45 dBA. Orange and red exceed the EPA's 55 dBA outdoor threshold linked to long-term health effects. Use the layer toggles to view each source on its own or all together.
What the numbers sound like
- 30 dBAWhisper
- 40 dBASoft rainfall
- 45 dBAQuiet suburban street at night
- 50 dBAQuiet office
- 55 dBAEPA outdoor threshold: light traffic 100 ft away
- 60 dBANormal conversation an arm's length away
- 65 dBABusy restaurant
- 70 dBAHighway traffic 50 ft away
- 80 dBACity bus interior
Population Above the EPA Outdoor Threshold
The EPA's 55 dBA outdoor reference level is a common benchmark for residential noise exposure, especially for activity interference, annoyance, and long-term community noise concerns. About 7 Rockville residents, or 2.4%, live above that level. By land area, 1.1% of Rockville is above 55 dBA.
See how noise in Rockville compares to similar-sized cities.
Noise by Part of Rockville
Average noise levels for Rockville residents, grouped by direction from the center of Rockville. Northern Rockville carries the highest population-weighted average; Eastern Rockville carries the lowest. Just 0% of residents in Eastern Rockville live in blocks above the EPA's 55 dBA threshold, a fifth of the share in Northern Rockville.
Eastern Rockville
0% of people above 55 dBA
Northern Rockville
4% of people above 55 dBA
Southern Rockville
1% of people above 55 dBA
Western Rockville
0% of people above 55 dBA
Northern Rockville sounds about 308% louder than Eastern Rockville to the human ear, a 20.3 dBA gap. Every 10 dBA roughly doubles perceived loudness. Within any of these directions, two homes a quarter mile apart can still differ by 10 or more dBA depending on how close they sit to a major highway.
How far back from Main St / Hwy 9 do you need to be?
Main St / Hwy 9 produces an estimated 60 dBA at its loudest centerline points. Noise drops logarithmically with distance, with the exact rate depending on what's between you and the road. Tree cover, walls, terrain, and pavement type all matter. At roughly a quarter mile back, traffic fades into the noise level of a soft rainfall.
Calculated from the model's calibrated attenuation formula. About 6% of Rockville sits under tree canopy (lighter than most cities) and roughly 1% is impervious surface like pavement and rooftops. Both are folded into the per-place decay rate above. Heavier canopy pulls noise down faster with distance; impervious surfaces slow the drop.