MEXICO MOVING UP
New on-highway diesel emissions standards planned for 2018 equivalent
to EPA 2010, Euro 6 regulations
Mexico announced it is plan- ning to adopt new on- highway diesel engine emissions standards regulating particulate
matter (PM), nitrogen oxides (NOx),
hydrocarbons (HC) and carbon monoxide (CO) from heavy-duty diesel
engines and vehicles, including trucks,
buses and large pickups and vans.
The revisions to the country’s existing
standards will, starting in 2018, put
new Mexican heavy-duty and medium-duty vehicles at the same level as the
United States, Canada, the European
Union, Japan and South Korea.
In early December, COMARNAT,
the national regulatory committee of
Mexico’s Secretariat of Environment
and Natural Resources (SEMARNAT),
approved a proposed update to the
country’s existing emissions regulations (NOM-044-SEMARNAT-20061).
Following a 60-day comment period
that ends in mid-February, COMARNAT
will hold another vote to finalize the
The proposed modifications establish maximum permissible emissions
limits of total HC, nonmethane hydrocarbons, CO, NOx and PM from the
diesels used in new vehicles with a
gross vehicle weight rating (GVWR)
greater than 3857 kg.
The new standards would require
new heavy-duty diesel vehicles sold
after Jan. 1, 2018 to meet emissions
standards equivalent to the U.S. En-
vironmental Protection Agency (EPA)
2010 rules and Europe’s Euro 6 regulations. Aligning with the those standards will require new vehicles to be
equipped in 2018 with diesel particulate filters (DPFs), advanced NOx
aftertreatment, full on-board diagnostic
(OBD) systems and fail-safe measures
to ensure correct operation of emissions control systems.
Mexico’s emissions standards for
heavy-duty diesel vehicles were first
established in 1993, and they followed
the EPA standards in force at the
time. Mexico updated its standards in
to allow compliance with either EPA
or EU requirements. The 2006 rules
were scheduled to run through June
of 2011, but they were later extended
through June 2014.
In June 2014, with work underway
on the current proposal, an additional
extension was granted until publication of the replacement for the existing standard.
The limit values set by the 2006
standards were equivalent to Euro 4 or
EPA 2004 regulations. The two compliance options differed significantly
in several ways, including emissions
levels, technologies and in-use performance, compliance costs and fuel
For example, Euro 4 called for significantly lower PM emissions than
EPA 2004. Euro 4 NOx limits were
slightly higher than EPA 2004, requiring the use of selective catalytic reduction (SCR) for NOx control, but that
also enabled changes in engine tuning
that provided additional PM control.
Compliance costs were also different depending on the option chosen,
as SCR systems and the use of diesel
The timing and certification requirements of the new on-highway diesel emissions standards
proposed for Mexico. Standard A, in force from the adoption of the proposal later this year
through 2017, is essentially the same as the current standard. Beginning in 2018, Standard B
requires proof of certification to either Euro 6 or EPA 2010 emissions regulations.
Unlike the Euro 4 and EPA 2004 standards that have been in effect in Mexico since 2006,
Euro 6 and EPA 2010 are functionally equivalent, with very similar limit values for NOx and
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