As of August 21, 2013 a new Official Mexican Standard, the purpose of which is, in general terms, to set up the maximum allowable limits of carbon dioxide (CO2) from the exhaust of new automotive vehicles of gross vehicle weight of up to 3,857 kilograms will enter into force. It is the Official Mexican Standard NOM-163-SEMARNAT-ENER-SCFI-2013 (NOM-163).

The NOM-163 complements the already existing Mexican Official Standard NOM-042-SEMARNAT-2003, which establishes the maximum allowable limits of emissions of total hydrocarbons or non methane, carbon monoxide, nitrogen oxides and particulates from the exhaust of the new automotive vehicles with a gross weight not exceeding 3,857 kilograms, using gasoline, liquefied petroleum gas, natural gas and diesel, as well as evaporative hydrocarbon emissions from the fuel system of such vehicles (NOM-042). The NOM-042, which was published in the Federal Official Gazette on September 7, 2005, only addresses the control of methane and evaporative hydrocarbons, carbon monoxide, nitrogen oxides and particulates, but does not mention carbon dioxide (CO2), unlike the NOM-163.

What is the NOM-163 about?

The NOM-163 sets up the parameters and methodology for the calculation of CO2 to be made by the corporation (meaning by "corporation" the individual or company, manufacturer or importer, who makes the first purchase of the new light motor vehicle on national territory) who places more than 500 units per year. The parameters are expressed in grams of carbon dioxide per kilometer (g CO2/km) and its equivalence in terms of fuel efficiency, expressed in kilometers per liter (km /l).

The Corporation Compliance in terms of CO2 emissions, is determined through the "acceptance criteria" in the manner established by the same NOM-163, and according to the formulas set on the NOM-163.

Within the NOM-163 it is also established a Program of Alternative Goals for those corporations which during the 2012 model-year have registered total annual sales between 501 and 2 500 units. The program will allow them to hold, during the assessment period of the NOM-163 model-year 2014 to 2016, up to a maximum of 7,500 light motor vehicles to the compliance of less demanding targets of CO2 emission.

Compliance with the NOM-163

The compliance with the NOM-163 will be accredited through the obtaining of the NOM Certificate of compliance issued by the Federal Bureau of Environmental Protection (PROFEPA), or in its case issued by the Certification Organizations duly accredited by the accreditation organization and approved by the PROFEPA.

The Ministry of Environment and Natural Resources, through PROFEPA, will be the authority in charge of monitoring this Official Mexican Standard according to the specifications provided in the same NOM-163, as well as to proceed with the penalties for noncompliance pursuant to the applicable law.