The details of Ricardo EMLEG

EMLEG (Emissions Legislation) is a comprehensive summary of worldwide exhaust emissions regulations provided by Ricardo.
The database covers not only exhaust emissions and fuel economy regulations on passenger cars and light duty trucks, but also widely regulations on heavy-duty vehicles, motorcycles and agricultural / constructing equipments, as well as standards and regulations on fuel quality and air environment. In addition, comments and explanations by Ricardo specialists are offered.

环保法规 (Only in English)

Worldwide gas emissions and fuel consumption regulations (provided by: Ricardo Emleg)

(Source: Ricardo EMLEG, As of May 2025)

WLTP (Worldwide Harmonized Light vehicles Test Procedures)

Worldwide Emission & Fuel Economy/CO2 Regulation Timeline (Passenger Cars & Light Duty Trucks)

Emission Standards	Europe	EU	EU	Passenger Cars & Light Duty Trucks
				Euro 7
			France	Passenger Cars & Light Duty Trucks
		Non-EU	Switzerland	Passenger Cars & Light Duty Trucks
			Norway	Passenger Cars & Light Duty Trucks
			Turkey	General
	Americas	North America	USA	U.S. Federal Passenger Cars & Light Duty Trucks
				U.S. Federal Passenger Cars & Light Duty Trucks (LDV/MDV 2027MY～) Update
				California State Passenger Cars & Light Duty Trucks
				California State Passenger Cars & Light Duty Trucks (LDV/MDV 2026MY～)
				Air Quality (California State)
			Canada	Passenger Cars & Light Duty Trucks
		South America	Mexico	Passenger Cars & Light Duty Trucks
			Brazil	Passenger Cars & Light Duty Trucks
	Asia	East Asia	China	Passenger Cars & Light Duty Trucks
				Heavy Duty Vehicles
			Korea	Passenger Cars & Light Duty Trucks
		South East Asia	Thailand	Passenger Cars & Light Duty Trucks
			Indonesia	General
		South Asia	India	Passenger Cars & Light Duty Trucks
Fuel Economy / CO2	Europe	EU	EU	General
			France	General
		Non-EU	Switzerland	General
			Norway	General
	Americas	North America	USA (CAFE, etc)	Federal
				USA Federal (LDV 2027MY～)
				California State
			Canada	General
	Asia	East Asia	China	General
		South East Asia	Thailand	General
		South Asia	India	General
Supplemental Information	Test cycles
	EU Vehicle Categories

Latest Updated

Date	Regulation	Region	Updated Summaries
6 February 2025	Emission Standards	USA Federal	In "Additional requirements" section, the status about restriction of enrichment is added.
22 January 2025	Fuel Economy/CO2	China	Phase 4 fuel consumption standards for heavy-duty vehicles were finalized and will apply from 1 July 2025 (for new type approval) and from 1 July 2027 (for all new registrations).
4 December 2024	Fuel Economy/CO2	China	For light commercial vehicles, a new regulation for 2026 and after was added on 23 August, and replaces the current ones.
27 November 2024	Emission Standards	Thailand	From 1 January 2025, Euro 6 emission standards are in place for SI engine light duty vehicles, skipping Euro 5 level.
1 November 2024	Fuel Economy/CO2	EU	The amendment in June 2024… (1)…defines & expands sub-categories of heavy duty vehicles for which CO2 emission standard is applied. (2)…determines CO2 reduction trajectory, with which credit/debit system is defined.
21 October 2024	Fuel Economy/CO2	India	Fuel efficiency standard Phase III and IV are issued in the form of memorandum in June 2024.
11 September 2024	Fuel Economy/CO2	USA Federal	Definition of MDV and CO2 emissions standards included in the new regulation are added.
2 August 2024	Fuel Economy/CO2	USA Federal	Contents are revised acc. to the new regulation published in final form in April 2024.
1 July 2024	Emission Standards	EU Euro 7	Fully revised, acc. to the finalized Euro 7 as Regulation 2024/1257 (published on 8 May 2024).
3 June 2024	Emission Standards	USA Federal	Final rule and GTR No.22 (2 and 3 of “REFERENCE”) are reflected.
28 May 2024	Emission Standards	USA Federal	References are added (14, 15) / replaced (7), with corresponding portions of the article minor-changed.
15 May 2024	Emission Standards	Mexico	The date of implementation of the C standards for diesel vehicles is clarified. The section of Test Procedures is deleted.
2 May 2024	Fuel Economy/CO2	USA (California State)	The history of Clean Air Act preemption waiver, and the status of LEV III GHG emission standards are re-affirmed.
23 April 2024	Emission Standards	India	The January 2024 amendment modified the standards regarding applicability and test fuel requirements.
15 April 2024	Fuel Economy/CO2	USA Federal	The EPA published the final regulation, the Phase 3 heavy duty GHG emissions standards.
22 February 2024	Emission Standards	Thailand	Light duty vehicles with CI engine need to comply with Euro 5. For gasoline LDV, timeline to implement Euro 5 reported.
15 February 2024	Fuel Economy/CO2	EU	Values specified in Regulations 2023/1634 and 2023/2502 added. Also derogation for small volume manufacturer detailed.

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The details of Ricardo EMLEG

环保法规 (Only in English)

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