This law applies to producers of cars of gross weight higher than 3 857 kg, and covers the following pollutants: hydrocarbons (HC), evaporative hydrocarbons (HCev, resulting from the system), non-methane hydrocarbons (HCNM, total excluding methane), non-methane HC and nitrogen oxides (HCNM + NOx), methane (CH4), carbon monoxide (CO), nitrogen oxides (NOx).
The emissions limits are provided in tables at the following link (official document): http://www.dof.gob.mx/normasOficiales/4948/SEMARNAT/SEMARNAT.html
Standard A refers to the maximum permitted limit for new cars produced from the start of (implementation of) the Official Mexican Regulation and until the implementation of standard B, 18 months after the publication of the initial regulations.