The standards (NOM-044-SEMARNAT-2017) were published in Febraury 2018. Starting on January 1, 2021, all new heavy-duty vehicles sold in Mexico will be required to meet the best-in-class, filter-based standards, equivalent to those in place in North America and the European Union. The Euro VI and US 2010 standards are introduced in 2019. For details, see reference below.