What Is The Legal Decibel Limit For A Car? and Figures for New Car Fuel Consumption and Emissions new for 2022

Drivers need to be aware of  What is the legal decibel limit for a car, as well as how this limit affects their fuel consumption and emissions. Most drivers are unaware of the legal decibel limit for a car, and as a result, they may not be driving within the law. This can lead to fines and other penalties.

Our article provides an overview of the legal decibel limit for a car in each US state, as well as information on Figures for new car fuel consumption and emissions.


What Is The Legal Decibel Limit For A Car?

According to current legal provisions, the noise limit for car meeting type approval is 74 decibels. It is illegal to modify a car’s exhaust system to make it noisier than the level at which it passed type approval with.

Figures for New Car Fuel Consumption and Emissions

Figures for New Car Fuel Consumption and Emissions
Figures for New Car Fuel Consumption and Emissions


This guide lists the performance figures for fuel consumption, CO2 emissions, and other tailpipe emissions of new cars currently on the market in the UK. It discusses the impact of road transportation on climate change and air quality, as well as ways to mitigate these effects. There is also advice on fuel selection and how to use and maintain a vehicle.

Cars and Emissions

Transport continues to be the largest emitter of greenhouse gases (GHG) in the UK, accounting for 27% of domestic emissions in 2019. The combustion process also produces gases and particles that can be harmful to one’s health. Poor roadside air quality has both immediate (acute) and long-term (chronic) consequences.

Cars and Noises

A new EU regulation went into effect in July 2016. Most new passenger cars will have a noise limit of 68 decibels (dB(A) by 2026. Some vehicles produce lower levels of noise, and it is illegal to modify a vehicle’s exhaust system to make it noisier.

Vehicle exhaust noise regulations in some states in US

Vehicle exhaust noise regulations in some states in US
Vehicle exhaust noise regulations in some states in US

Here are Exhaust Noise Laws by State in the US. Below are some states’ laws. Please keep in mind that state laws are subject to change, and it is critical to consult your state’s current statutes and regulations to ensure accurate information.


§ 32-5-216.

Every motor vehicle must have a muffler in good working order and running at all times to prevent excessive or unusual noise and annoying smoke.

READ:  How To Deice A Car Door?

§ 33-5-23.

Except for vessels competing in a regatta or official boat race, the use of cutouts is prohibited.


Locally governed.


§ 28-955: Mufflers; noise and air pollution prevention; emission control devices; civil penalty; exception


§27-37-601:Noise or smoke-producing devices are prohibited under Section
§ 27-37-602: Cutouts are not permitted.


 § 27150:A suitable muffler is required.
 § 27151:Exhaust system modifications


42-4-225: Mufflers – noise reduction


Connecticut General Statutes

14-80:  Mechanical equipment.

14-80a-4a: Noise levels permitted


Title 11 § 4311: Mufflers with cutouts are prohibited
Title 21 § 2197: Street Rods


§ 316.272: Exhaust systems, noise reduction
§ 316.293: Noise from Motor Vehicles


§ 40-8-71:Exhaust system; noise, smoke, and fumes suppression


§ 291-24.5: Muffler for a car.


§ 49-937:Noise-cancelling mufflers


§ 625 ILCS 5/12-602: Noise-cancelling mufflers


9-19-8-2: Muffler should be free of visible conditions.

9-19-8-3. Muffler or other noise-dissipating device to meet specific requirements.

9-19-8-4.  Equipment prohibited.


§ 321.436: Noise-cancelling mufflers


§ 8-1739:  Mufflers and noise-cancelling systems


§ 189.020: Vehicle equipment must not be a nuisance or a threat.

§ 189.140: Mufflers are used to reduce noise.

§ 224.30-190: It is prohibited to modify a motor vehicle’s exhaust system in order to increase noise.


§ 32:352: Mufflers; requirements; noise, fumes, and smoke reduction

§ 32:353: Exhaust system modifications


§ 1912:  Mufflers


§ 22-402: Mufflers; noise reduction; smoke discharge; maximum idling time

§ 22-609: Exhaust system modification


Chapter 90 § 7: Standards for brakes, lights, and other equipment

Chapter 90 § 16.: Motor vehicle operation that is offensive or illegal


§ 257.707b: Exhaust system; specifications

§ 257.707c: Noise restrictions and prohibitions


§ 169.69: Muffler


§ 63-7-55: Mufflers


§ 307.170: Other motor vehicle equipment—violations and penalties

Standards for Vehicle Noise

Standards for Vehicle Noise
Standards for Vehicle Noise


This section defines the terms scale level and sound pressure level. The scale level is the total sound level of all noise as measured with an A-weighting network sound level meter. The decibel is the unit of measurement.

Limits on Motor Vehicle Noise

Noise was measured at a height of at least four feet (4′) and a distance of twenty-five feet (25′) (7.5 m) from the near side of the nearest lane being monitored (1.2 m). This section’s subsections A1 and A2 apply only to vehicles traveling on streets with posted speeds of forty (40) miles per hour or less.

READ:  Where Brake Fluid Is Located?

This section applies to the total noise produced by a vehicle or combination of vehicles and shall not be construed as limiting or precluding the enforcement of any other provisions of this title relating to noise control motor vehicle mufflers.

No one shall sell, lease, or offer for sale or lease any motor vehicle of the above-mentioned type that exceeds the maximum decibel levels specified above.

Any vehicle found to be out of compliance with this chapter and manufactured before January 1, 1974, may be exempt from the noise levels specified herein.

An exemption may be granted if the mayor, or his or her designated representative, is satisfied that the above-mentioned condition exists, making compliance impossible.

This provision does not apply to new equipment that, as manufactured, could have met the noise levels specified above but has since been modified to no longer meet those standards.

Sound Level Measurement

Sound levels are measured in accordance with the Society of Automotive Engineers, the American National Standards Institute, or any other procedure adopted and tested by the city departments charged with enforcing this chapter.

The A-weighting scale should be used to measure sound levels with a sound level meter.

Enforcement and Evaluation of testing

For the purposes of enforcing this chapter, the Salt Lake City police department may be equipped with the appropriate equipment for measuring sound levels, as provided in section 12.88.030 of this chapter or its successor. The department may also use equipment provided by other agencies.

A vehicle’s owner may transport it to a central testing facility for further evaluation. If such vehicle is reevaluated and found not to be in violation of the above-mentioned decibel standards, no further proceedings will be initiated, and any citation issued will be dismissed.

Legal decibel limit for a car exhaust

Legal decibel limit for a car exhaust
Legal decibel limit for a car exhaust

What is the decibel limit for exhausts? 

When your exhaust system lets loose, a deep sense of satisfaction slips through your vibrating bones, but that happy grin quickly fades when you enter a residential district.

Your car exhaust is clearly making too much noise. It violates some local ordinances and irritates your neighbors. Let’s appease the street’s howling dogs and irate residents by ensuring your exhaust noise level is street legal.

Get a Noise Perspective

The decibel scale measures the intensity of sound. The sound’s volume is calibrated on a logarithmic scale. When you’re listening to a normal conversation, you’re hearing 60 decibels (dB). A loud party raises that figure to 70 decibels.

READ:  How Many 50th Anniversary Mustangs Were Made?

Respecting the Legal Decibel Limits

An aggressive legal decibel limit for exhaust system can easily throw out a 110-dB roar. The EPA (Environmental Protection Act) legislates a 90-dB limit, although motorcycles are allowed to reach a 94-dB threshold. Use your own sound level tester or a garage inspection test to avoid a violation.

FAQs: What Is The Legal Decibel Limit For A Car? and Figures for New Car Fuel Consumption and Emissions

How many dB is the average car?

Noise Source Decibel Level
Passenger car at 65 mph at 25 ft (77 dB); freeway at 50 ft from pavement edge 10 a.m. (76 dB). Living room music (76 dB); radio or TV-audio, vacuum cleaner (70 dB). 70
Conversation in restaurant, office, background music, Air conditioning unit at 100 ft 60

Is it illegal to have a loud exhaust UK?

If your car’s exhaust noise is too loud or if it emits extra pollutants, you may be fined £50 and have your vehicle taken off the road in the UK.

Is it bad to keep the engine running while parked?

Car idling isn’t always bad for your car, but it does have consequences. … If you leave your automobile running for more than an hour, you can waste almost a gallon of gasoline. Burns up oil. More motor oil is circulated and burned in the long run because to longer periods of vehicle operation.

What is the legal dB for exhaust UK?

In the United Kingdom, the legal limit for exhaust noise is 74 decibels, which is roughly the volume of a flushing toilet.


Amortips.com hope this article was helpful in answering the question, “What is the legal decibel limit for a car?” as well as providing information about fuel consumption and emissions for new cars. If you have any further questions, please do not hesitate to reach out to us. Thank you for reading!

Related Searches

legal decibel limit for a car exhaust
legal exhaust decibel limit ny
legal exhaust decibel limit ontario
massachusetts exhaust laws 2020
loud exhaust ticket cost
dot exhaust regulations
motorcycle noise laws by state
is straight pipe legal in california

See more articles in category: FAQ