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.

Emissions & CO2

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

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~)
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
UN regulations Table of amended regulations  by JASIC 
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~) Update
California State
Canada General
Asia East Asia China General
South Asia India General
UN regulations Table of amended regulations by JASIC
Noise UN regulations Table of amended regulations by JASIC
Supplemental Information Test cycles
EU Vehicle Categories

Latest Update

Date Regulation Region Updated Summaries
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.
11 January 2024 Emission Standards Brazil The calculation of fleet average emissions and the trading of credits are detailed.
6 December 2023 Emission Standards California State The section of CARB Zero Emission Vehicle programme is added.
4 December 2023 Emission Standards India The updating in November 2023 - confirmation and minor additions / deletions of information/
20 October 2023 Fuel Economy/CO2 EU Update issued in February 2023, proposing amendments for Heavy duty vehicles:
1. Applicability expanded.
2. %-based CO2 emission reduction target after 2030 added.
3. Zero-emission vehicle target for urban buses added.
18 October 2023 Fuel Economy/CO2 USA Federal Proposed, updated GHG (greenhouse gas) emissions standards for light duty vehicles have been published by the EPA.
16 September 2023 Emission Standards USA Federal The EPA published a proposal containing updated emissions requirements for light duty and medium duty vehicles in May 2023.
22 June 2023 Emission Standards China Heavy Duty Vehicles In May 2023, the Ministry of Environment published a statement confirming that all heavy duty diesel vehicles produced, sold and imported in China will also have to comply with the 6b requirements, from 1 July 2023.
21 June 2023 Emission Standards China In May 2023, the Ministry of Environment published a statement to confirm that all light duty vehicles produced, sold and imported in China from 1 July 2023 will have to comply with the China 6b requirements.
21 June 2023 Fuel Economy/CO2 EU 1. EC will define a methodology to calculate Lifecycle CO2 emission by End/2025.
2. Regulation 2023/851 was published in April 2023.
3. Reduction rates of EU-fleetwide CO2 were changed.
4. Definition of ZLEV factors were changed.
5. Treatment of trailers (Cat. O3 and O4) was deteiled in Regulation 2022/1362.
25 May 2023 Emission Standards EU Following the publication & implementation of regulation 2023/443, regulation 2017/1151 is amended, which influences many standards and procedures.
2 May 2023 Emission Standards Thailand The Government indicated that introduction of Euro 5 standard is postponed to January 2024.