CONAMA 17/95 – Maximum emission limit rates for regular or modified passenger vehicles

CONAMA RESOLUTION 17, December 13, 1995
Published in Official Gazette 249 on Dec. 29, 1995, Section 1, pages 22878-22879

· Changes CONAMA Resolution 1/93 (changes the annex I), for cases when the vehicle is manufactured form a bus chassis or bus platform undercarriage, supplied by a third party.
· Ratifies art. 20 of CONAMA Resolution 8/93 except for the demands established for the date of January 1, 1996.

Establishes the maximum emission limit rates for regular or modified passenger vehicles.

The NATIONAL ENVIRONMENT COUNCIL – CONAMA, in the use of the power bestowed upon the Council by Laws 6.938 from Aug. 31, 1981, regulated by Decree 99.274 from June 6, 1990 and alterations and in light of its Internal Regulations, and,
Considering the provisions of CONAMA Resolutions 1, 2 and 8 (art. 20) from 1993 which establish requirements related to noise level emission limits for motorized vehicles;
Considering that all commercialized vehicles within the national territory must comply with maximum noise emission limits;
Considering that the undertaking of modifications in vehicles can change noise emission levels;
Considering the difficulties related to the previsions of annual manufacturing volumes for the assembling of changed passenger vehicles in relation to the requirements set by CONAMA Resolutions 1 and 8 (art. 20) from 1993, decides:

Art. 1 To ratify the maximum noise levels and the schedule for their implementation according to article 20 of CONAMA Resolution 8/93, except for the demand established for the date of Jan. 1, 1996.

Art. 2 All vehicles subjected to modifications or completions in relation to their original project must uphold compliance with CONAMA noise emission requirements.

Art. 3 For all purposes of this Resolution, the parties responsible for changed, complemented or modified vehicles or modifications of parts that have a direct relationship with noise emissions, are considered as the final manufacturers of the respective vehicles and are responsible for the fulfillment of requirements set by CONAMA.

§1 IBAMA may, at its own discretion, in cases where changes have been made to systems that are directly related to noise emissions, but according to methods that do not alter noise emission levels and in cases related to modifications made because of other legal demands, exempt the manufacturer from the presentation of prototype verification reports and production follow-up reports.

§ 2 If the vehicle is manufactured from a bus chassis or a rolling bus platform undercarriage, supplied by a third party, the vehicle is subjected , for all possible purposes, to the provisions set by CONAMA Resolutions 1 and 8 (art. 20) from 1993, and the adoption of provisions set by annex A1 of this Resolutions which substitutes annex A of CONAMA Resolutions 1 from 1993.

Art. 4 The definitions established in annex B1, art. 5, apply to all purposes of this Resolution.

Art. 5 It is the duty of IBAMA to deliberate on cases that have been omitted by this Resolution.

Art. 6 Non-compliance with the provisions set by this Resolution will import penalties that are foreseen by current federal , state and municipal legislation.

Art. 7 This Resolution shall enter into effect on the date of its publication and all provisions to the contrary are hereby revoked.


  1. Chassis Brand/ Platform Undercarriage:
  2. Chassis Model/ Platform Undercarriage/ production year/chassis type/ Platform Undercarriage:
    2.1. List of represented configurations:
    2.2. Total Gross Weight: (kg)
    2.3. Technical criteria for the definition of the master configuration and represented configuration
  3. Chassis/ platform undercarriage manufacturer’s name and address;
  4. Name and address of the Legal Representative of the manufacturer of the Chassis/ Platform Undercarriage;
  5. Name and address(s) of importer(s) of the chassis/platform undercarriage;
  6. Brand of body;
  7. Name and address of the body manufacturer;
  8. Name and address of the body’s manufacturer legal representative;
  9. Name and address of the body’s importer(s), if applicable;
  10. Engine
    10.1 Manufacturer:
    10.2 Type:
    10.2.1 Otto/Diesel;
    10.2.2 Cycle: 2/4 cycles;
    10.3 Model:
    10.4 maximum power:(kW) to (1/min) (rpm)
    10.5 Cylindrage: (cm3) (l)
  11. Transmission
    11.1 Gear Box: manual/automatic
    11.2 Total number of gears (except back gear), including the transmission association
  12. Hardware/Materials
    12.1 Exhaust system (sketch)
    12.1.1 Fibrous materials in Contact with Gases: YES/No
    12.2 Air intake silencer
    12.2.1 Manufacturer
    12.3 Catalytic conversor (if applicable)
    12.3.1 Manufacturer
    12.4 Tire designation (ABPA – Brazilian Tire and Hoops Association)
    12.5 Additional specifications deemed as important by the manufacturer in order to safeguard compliance with this Resolution.
  13. Measurements
    13.1 Acceleration noise levels according to NBR-8433
    13.2 Noise levels while running but still according to NBR-9714
    13.3 Maximum exhaust system backpressure allowable rate (according to Annex E of CONAMA Resolution 1, 1993) __ (kpa)(___________ mHg).
    13.4 Exhaust system measured backpressure rate:
  1. Tested vehicle data:
  2. Test report data:
  3. Test report number:
  4. Location:
  5. Date:
  6. Name and signature of test Manager:


Alteration of parts directly related to noise emissions: the following are considered alteration of parts:

  • exhaust system;
  • noise reduction system;
  • powertrain;
  • chassis;
  • adaptation of the auxiliary axis;

Body: part of the vehicle that houses the driver, passengers and/or load;

Buss Chassis: part of a bus that is composed of the parts needed for its67 movement and which supports the body;

Vehicle complementing: addition of vehicle equipment (dispositive incorporated to a vehicle in order to allow it to fulfill its purpose or increase its transportation capacity);

dB(A): sound level pressure unit in decibel, weighted by the frequency response curve A, for the quantification of noise levels;

Auxiliary vehicle axle: vehicle axle adapted to a road motor vehicle with two axles through the reinforcement of the chassis and aimed at allowing an increase of its load capacity, commonly named the third axle;

Coach building: production of a passenger or mixed use vehicle through the use of a platform undercarriage or chassis for buses supplied by a third party;

Vehicle modification: joint operations performed on a vehicle that changes any of the following parts:

  • body;
  • chassis;
  • powertrain;
  • exhaust or noise reduction systems.

Total Gross Weight (PBT): Weight stated by the manufacturer for specific operational conditions, based on material resistance considerations, tire load capacity, etc., according to NBR-6070.

Platform Undercarriage for buses: part of a bus that contains a platform and/or inferior body structure (monoblock) and composed by the parts that are necessary for its movement;

Maximum Power: maximum effective liquid power according to NBR-5484, expressed in kW (kilowatts).

Exhaust System: group of parts including the exhaust collector, exhaust pipe, discharge pipe, expansion chamber(s), silencer(s) and conversor(S), when applicable;

Noise reduction system: dispositive used for noise reduction purposes of the noises emitted by the vehicle, can be composed of barriers or acoustic isolations as well as encapsulations of power train components;

Power train: groups of parts that include the engine (including the fuel injection system, cooling, air intake and, if applicable, supercharging) and transmission system;

Production conformity verification: verification and confirmation that the vehicles, or the exhausts systems available within the car parts market, produced in series or not, comply with the maximum noise limits and other demands set by this Resolution;

Prototype testing: testing of a vehicle prior to its production and commercialization as characterized by the manufacturer according to its master configuration, in order to verify compliance with the maximum noise levels, and other demands, established by this Resolution.