G/TBT/N/MEX/362  
30 June 2017 
(17-3537) Page: 1/2 
Committee on Technical Barriers to Trade  Original:  Spanish  
 
  
NOTIFICATION  
The following notification is being circulated in accordance with Article 10.6.  
 
1. Notifying Member : MEXICO  
If applicable, name of local government involved (Articles 3.2 and 7.2):   
2. Agency responsible : Secretaría de Medio Ambiente y Recursos Naturales  (Ministry of the 
Environment and Natural Resources)  
Name and address (including telephone and fax numbers, email and website 
addresses, if available) of agency or authority designated to handle comments 
regarding the notification shall be indicated if different from above:  
Av. Ejército Nacional 223, Piso 16  
Colonia Anáhuac, Delegación Miguel Hidalgo  
C.P. 11320, Ciudad de México  
Email: manuel.flores@semarnat.gob.mx  
3. Notified under Article 2.9.2 [X], 2.10.1 [ ], 5.6.2 [ ], 5.7.1 [ ], other:  
4. Products covered (HS or CCCN where applicable, otherwise national tariff 
heading . ICS number s may be provided in addition, where applicable) : Motor 
vehicles  
5. Title, number of pages and language(s) of the notified document : Proyecto de 
modificación a la Norma Oficial Mexicana NOM -050-SEMARNAT -1993, que establece los 
niveles máximos permisibles de emisión de gases contaminantes provenientes del escape 
de los vehículos automotores en circulación que usan gas licuado de petróleo, gas natural 
u otros combustibles alternos como combustibles, para quedar como Norma Oficial 
Mexicana NOM -050-SEMARNAT -2017, que establece los límites máximos permisibles de 
emisión de gases contaminantes provenientes del escape de los vehículos automotores en 
circulación que usan gas licuado de petróleo, gas natural u otros combustibles alternos  
(Draft amendment to Mexican Official Standard NOM -050-SEMARNAT -1993 establishing 
the maximum permissible levels for emissions of gaseous pollutants from the exhausts of 
motor vehicles powered by liquefied petroleum gas, natural gas or other alternative fuels, 
which is to become Mexican Official Standard NOM -050-SEMARNAT -2017 establishing the 
maximum permissible levels for emissions of gaseous pollutants from the exhausts of 
motor vehicles powered by liquefied petroleum gas, natural gas or other alternative fuels)  
(9 pages, in Spa nish)  
6. Description of content : The notified Standard is binding for the owners or lawful 
possessors of motor vehicles circulating in the country, which are powered by liquefied 
petroleum gas, natural gas or other alternative fuels.  It is also binding f or officials from 
control centres and, where appropriate, vehicle verification units.  
 
The notified Standard does not apply to vehicles with a gross vehicle weight of 400 kg or 
less, hybrid vehicles, motorcycles, agricultural tractors, or machinery used in the 
construction and mining industries, or to motor vehicles circulating in the federa l entities of 
Mexico City, Hidalgo, Mexico State, Morelos, Puebla and Tlaxcala, which use natural gas, 
liquefied petroleum gas or alternative fuels.  G/TBT/N/MEX/362  
- 2 - 
  7. Objective and rationale, including the nature of urgent problems where 
applicable : The notified Mexica n Official Standard establishes the maximum permissible 
limits for emissions of  hydrocarbons, carbon monoxide and nitrogen oxide ; the minimum 
and maximum level of carbon monoxide and carbon bioxide taken together ; and the 
lambda factor o f motor vehicles po wered by liquefied petroleum gas, natural gas or other 
alternative fuels.  
8. Relevant documents : NOM-047-SEMARNAT -2014, Que establece las características del 
equipo y el procedimiento de medición para la verificación de los límites de emisión de 
contamina ntes, provenientes de los vehículos automotores en circulación que usan 
gasolina, gas licuado de petróleo, gas natural u otros combustibles alternos (Mexican 
Official Standard NOM -047-SEMARNAT -2014 establishing the characteristics of the 
equipment and the measuring procedure used to verify levels of pollutant emissions from 
motor vehicles using gasoline, liquefied petroleum gas, natural gas or other alternative 
fuels) , published in the Official Journal on 2 6 November 2 014.  
9. Proposed date of adoption : The notified draft Mexican Official Standard will be adopted 
upon its publication in the Official Journal as a final Mexican Official Standard.  
Proposed date of entry into force : This Mexican Official Standard will enter into force 
90 calendar days after pu blication in the Official Journal.  
10. Final date for comments : n/a 
11. Texts available from : National enquiry point [X] or address, telephone and fax 
numbers and email and website addresses, if available, of other body:  
Secretaría de Economía  
Subsecretaría de Competitividad y Normatividad  
Dirección General de Normas  
Tel.: (+52) 55 5729 9100, Ext. 43217  
Fax: (+52) 55 5520 9715  
Website: http://www.economia -noms.gob.mx/?P=144  
Email : normasomc@economia.gob.mx  and/or sofia.pacheco@economia.gob.mx  
Text available online at:  
http://www.dof.gob.mx/nota_detalle.php?codigo=5488461&fecha=29/06/2017  
 
https://members.wto.org/crnattachments/2017/TBT/MEX/17_2993_00_s.pdf