Type of project Institution responsible Description Objective Methodology and assumptions NOM-163-SEMARNAT-ENER-SCFI-2013. Secretary of Environment and Natural Resources, Secretary of Energy, Secretary of Economy. NOM-163-SEMARNAT-ENER-SCFI-2013, on CO emissions from the exhaust and its equivalence in terms of fuel efficiency, applicable to new motor vehicles with a gross vehicle weight of up to 3,857 kilograms. It is an efficiency standard for light vehicles, published in 2013, applicable for model years 2014, 2015 and 2016 marketed in Mexico. Subsequently, the validity was extended through two notices for the years 2017 and 2018, in order to publicize the parameters for the calculation of CO emissions in new light motor vehicles. Once the validity of the &quot;Notice for the year 2018&quot; has ended, the modification to this regulation has not been published. However, said modification establishes the application of NOM 163 on a voluntary basis for the 2019 and 2020 model years and on a mandatory basis for from model year 2021 and up to model year 2025 (INECC, 2020) Due to the above, the mitigation for the operation in the period 2018 to 2020 of the vehicles sold during the period of application of the standard is estimated: model years 2014, 2015 and 2016. Increase fuel efficiency in new light vehicles to consequently reduce greenhouse gas emissions, particularly carbon dioxide, due to the decrease in unit energy consumption Take advantage of other benefits, such as the reduction of emissions of local pollutants, improvement in air quality and, therefore, reduction of negative impacts on the health of the population.Other benefits correspond to increasing energy security, partial homologation with the regulation of emissions of CEI for light vehicles and the corporate average for fuel economy in the United States of America (INECC, 2020). Sales are considered during the validity of the regulation under the premise that said vehicles continued to operate in the years 2018 to 2020. To calculate the mitigation, the difference in the average performance of the fleet for the years 2014 to 2016. This difference is obtained by adjusting data from the Eco-Vehicles database to an econometric model with the following specification: eim = a norm + apost-norm + model + model x norm+ model x post-norm + y + 8m + im Where