How loud is it inside a car?
Dosimeters carried on 148 car trips in Connecticut gave an overall median of 69.4 dBA inside the vehicle, and median levels for individual drivers ranged from 65.0 to 77.2 dBA. An older US EPA estimate put car interiors at 67 dBA at 30 mph and 77 dBA at 60 mph.
- Level
- 65–77.2 dBAA-weighted sound level
- Daily limit
- No daily limitNIOSH, at the loud end
- Versus conversation
- 7.2× energyabout 1.8× as loud
What the numbers mean
How it was measured. One-minute average levels from dosimeters carried by 14 drivers on 148 trips in Hartford County, Connecticut, 2022. Medians for individual drivers ranged from 65.0 to 77.2 dBA; the overall median was 69.4 dBA.
In a 2022 study, 14 participants carried noise dosimeters and GPS receivers in a backpack on their daily trips. Across 2,435 one-minute measurements on major roads the median was 69.4 dBA, with half of all minutes between 65.7 and 74.1 dBA, and 9% of minutes exceeded 80 dBA. Faster driving and heavier traffic both raised the level, but much of the variation was unexplained; the authors suggest vehicle factors such as make, model, engine power and age play a part.
Those figures agree with older work. The US EPA estimated mean interior levels of 67 dBA at 30 mph and 77 dBA at 60 mph, and another study cited in a 2009 New York paper found 76.9 to 78.3 dBA in cars.
How long is safe?
Below 85 dBA, the level NIOSH allows for a full 8-hour day.
| Level | NIOSH limit (85 dBA, 3 dB rule) | OSHA limit (90 dBA, 5 dB rule) | UK/EU 80 dB(A) action value reached after | UK/EU 85 dB(A) action value reached after |
|---|---|---|---|---|
| 77.2 dBA | No limit | No limit | Not reached in 24 h | Not reached in 24 h |
Times are for a whole day’s exposure, with the rest of the day quiet. The workplace limits were written for adults at work, not for children. Work out a mixed day with the noise dose calculator.
Protecting your hearing
Keep windows closed at motorway speed and set the radio no louder than needed for comfort; on long drives, a quieter cabin also reduces fatigue.
Earplug and earmuff ratings (NRR in the US, SNR in the UK and EU) are lab figures; real-world protection is usually lower. How to read the ratings.
Compared with sounds nearby
Using midpoints of each range. Energy multiplies by 10 every 10 dB; perceived loudness roughly doubles (why).
- Crickets (40–96 dBA): this has about 2× its sound energy and sounds about 1.2× as loud.
- Snowmobile (65–73 dBA max): this has about 1.6× its sound energy and sounds about 1.2× as loud.
- City street traffic (73.4 dBA): it has about 1.7× the sound energy of this and sounds about 1.2× as loud.
- Dental drill (68–80.7 dBA): it has about 2.1× the sound energy of this and sounds about 1.3× as loud.
- Normal conversation (55–70 dBA): this has about 7.2× its energy and sounds about 1.8× as loud.
Questions
How loud is it inside a car?
A study of 148 trips found a median of 69.4 dBA, with individual drivers' medians from 65.0 to 77.2 dBA.
Is it louder at motorway speed?
Yes. The US EPA estimated 67 dBA at 30 mph and 77 dBA at 60 mph.
Sources
- Exploring the relationship between traffic, speed, and personal in-vehicle noise exposure during commutes, Transportation Research Interdisciplinary Perspectives (2026). Supports: dB_low 65.0, dB_high 77.2 dBA.
The median noise levels for individual participants varied widely, ranging from 65.0 dBA to 77.2 dBA.
Checked 2026-11-03. - Exploring the relationship between traffic, speed, and personal in-vehicle noise exposure during commutes, Transportation Research Interdisciplinary Perspectives (2026). Supports: 69.4 dBA median; IQR.
The overall median 1-minute noise level across all measurements was 69.4 dBA (IQR = 65.7–74.1).
Checked 2026-11-03. - Exploring the relationship between traffic, speed, and personal in-vehicle noise exposure during commutes, Transportation Research Interdisciplinary Perspectives (2026). Supports: 9% over 80 dBA.
Nine percent of measurements exceeded 80.0 dBA
Checked 2026-11-03. - Noise levels associated with New York City's mass transit systems, American Journal of Public Health (Neitzel et al., 2009). Supports: EPA 67 and 77 dBA.
the EPA estimated that passenger cars have mean interior noise levels of 67 dBA at 30 miles per hour and 77 dBA at 60 miles per hour
Checked 2026-11-03. - Noise levels associated with New York City's mass transit systems, American Journal of Public Health (Neitzel et al., 2009). Supports: 76.9 to 78.3 dBA.
Automobile noise levels in that study ranged from 76.9 to 78.3 dBA.
Checked 2026-11-03.
This page is general information, not medical advice. If you have ringing in your ears, muffled hearing or any change in your hearing, see an audiologist or your doctor.