Fact #825: June 16, 2014 Tier 3 Non-Methane Organic Gases Plus Nitrogen Oxide Emission Standards, Model Years 2017-2025

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The Environmental Protection Agency finalized Tier 3 emission standards in a rule issued in March 2014. One effect of the rule is a decrease in the combined amount of non-methane organic gases (NMOG) and nitrogen oxides (NOx) that new light vehicles with gasoline engines are allowed to produce for model years 2017 to 2025. These standards apply to a corporate average, meaning that some vehicles produced in those model years will emit more than the standard, while others will emit less, so long as the average for each Original Equipment Manufacturer (OEM) product offerings meets the standard.

Tier 3 NMOG+NOx Emission Standards, Model Years 2017-2025

Graph of the Tier 3 NMOG+NOx Emission Standards for model years 2017 through 2025. See the table for more detailed information.

Notes:
Standards shown are for the Federal Test Procedure. Different standards apply to the Supplemental Federal Test Procedure. For vehicles over 6,000 lbs. gross vehicle weight rating (GVWR), the standards apply beginning in MY 2018.
LDV = Light-duty vehicles.
LDT1 = Light trucks less than 6,000 lbs. GVWR and less than 3,750 lbs. loaded vehicle weight (LVW).
LDT2, 3, 4 = Light trucks less than 8,500 lbs. GVWR and more than 3, 750 lbs. LVW.
MDPV = Medium-duty passenger vehicles.

Supporting Information

Tier 3 NMOG+NOx Emission Standards, MY 2017-2025
(Milligrams per Mile)
Year LDV and LDT1 LDT2,3,4 and MDPV
2017 86 101
2018 79 92
2019 72 83
2020 65 74
2021 58 65
2022 51 56
2023 44 47
2024 37 38
2025 30 30
Note: Standards are for the Federal Test Procedure. Different standards apply for the Supplemental Federal Test Procedure.
Source: U.S. Environmental Protection Agency, Tier 3 Vehicle Emission and Fuel Standards Program.

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