Light Duty Vehicles Emissions Standards

The Mexican standards NOM-042-SEMARNAT-2003 settle a cap for air pollutants of new motor vehicles.
It covers CO, HCNM and NOx emissions of gasoline, LPG, natural gas and diesel light-duty vehicles. 

This regulation is equivalent to an evolution of emission standards to a US Tier 1-2, or moving to Euro 3-4 standards. Said regulation has been in place since 2004.

Durability standards varies with the vehicle model year, being more stringent for 2007 and newer model year vehicles. 

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