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 (PC & LDT)
Emission Standards Europe EU EU Countries PC & LDT
France PC & LDT 
Non-EU Switzerland PC & LDT 
Norway PC & LDT 
Turkey General 
Americas North America USA PC & LDT (Federal) 
PC & LDT (California State) 
Air Quality (California State) 
Canada PC & LDT 
South America Mexico PC & LDT
Brazil PC & LDT Update
Asia East Asia China PC & LDT 
Korea PC & LDT
South East Asia Thailand PC & LDT 
Indonesia General Update
South Asia India PC & LDT 
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)
California State
Canada General
Asia East Asia China General 
South East Asia Thailand 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
Vehicle Class Category (EU)
Vehicle Class Category (US)

Latest Update

Date Regulation Region Updated Summaries
10 October 2017 Emission Standards Brazil

The information on the proposed emission control programme PROCONVE L 7 and L8 is updated. Both programmes are due to be introduced in 2022 and 2027 respectively.

25 September 2017 Emission Standards Indonesia

In March 2017, the regulation to introduce Euro 4 standards for light duty vehicles and Euro IV for heavy duty vehicles was signed.

These new standards are likely to match with the introduction of Euro 4/IV fuel, which is October 2018 for gasoline and March 2021 for diesel.
08 September 2017 Emission Standards EU 1) Real driving emissions (RDE) standards have been developed and are being implemented from 1 September 2017.
2) The introduction schedule for the Euro 6 stages is revised by regulation 2017/1347.
3) An amended Type 4 test will apply from 1 September 2019 to all new registered vehicles according to regulation 2017/1221.
21 August 2017 Fuel Economy/ CO2 USA (California State) 1. The Phase 2 standards for MY 2022 to 2025 light duty vehicles are still under re-consideration by the EPA at a federal level.
2. The California ARB jointly developed the Phase 2 heavy duty standards with EPA and plans to present a draft California Phase 2 programme in early 2018.
16 August 2017 Fuel Economy/ CO2 EU A proposed regulation for the monitoring and reporting of HDV CO2 emissions and fuel consumption was published in May 2017. The monitoring is set to start on 1 January 2019.
12 July 2017 Fuel Economy/ CO2 Canada A proposal for introducing Phase 2 standards from 2018, in line with the equivalent US standards, was published in March 2017.
23 June 2017 Fuel Economy/ CO2 India Fuel economy regulations for passenger vehicles are in place and are effective from 1 April 2017.
12 June 2017 Emission Standards Korea 1) Current emission standards are based on the CARB LEV III standards for light duty gasoline vehicles and on Euro 6 standards for light duty diesel vehicles.
2) The information about OBD thresholds for diesel vehicles applicable from 2015 was added.
May 11 2017 Emission Standards Korea In April 2017 it was reported that real driving emissions (RDE) on-road testing will be introduced for diesel passenger vehicles starting in September 2017.
April 27, 2017 Emission Standards Mexico On 26 December 2016 the draft standards for in-use vehicles was published and would be due on 30 June 2017.
April 18, 2017 Fuel Economy/ CO2 USA (Federal) The EPA intends to make a final determination on whether MY2022-2025 standards for light-duty vehicles will remain unchanged by 1 April 2018.
April 14, 2017 Emission Standards China
1. A draft China VI standards were published in October 2016.
2. The type approval according to these standards will start on 1 January 2019
3. Beijing VI standards were superseded by China VI standards and will not be implemented.
April 7, 2017 Emission Standards EU 1) On 20 February 2017 the Council of the EU decided not to raise any objection to the adoption of the Commission proposal for the introduction of the WLTP.
2) Provided no objection to the legal grounds is raised by the European Parliament, the official regulation introducing the WLTP could be published in April or May 2017.
March 27, 2017 Emission Standards Brazil 1) It was reported at the beginning of 2017 that a proposal for new phase of PROCONVE programme has been prepared to reduce NOx emission up to 80% in comparison with current standards and also to set CO2 limits.
2) The new regulation is expected to apply from 2020.
March 17, 2017 Emission Standards China
The China 6 standard was released on 23 December 2016 and type approval according this standard is implemented from this date. All new vehicles will have to comply with the requirements of Phase 6a from 1 July 2020.
March 9, 2017 Fuel Economy/ CO2 USA (Federal) In January 2017 the EPA published the conclusions of a mid-term evaluation of the Phase 2 light-duty greenhouse gases standards and confirmed that the standards for model years 2022-2025 remain in place without changes.
February 24, 2017 Emission Standards Turkey 1.Passenger cars and light duty trucks are required to meet Euro 6 standards with effect from 1 January 2016 for new type approvals.
2.As for Non-road Mobile Machinery Engine Emission, the implementation of Stage IIIB and Stage IV limits has been delayed.
3. 10ppm sulphur diesel and gasoline are reported to be available in Turkey.
February 20, 2017 Emission Standards EU Real driving emissions (RDE) standards have been developed and will be implemented from 1 September 2017.
February 9, 2017 Emission Standards Mexico The applicability of emergency limits of pollutants to all in-use vehicles in Mexico City and the several states was extended for further six months, starting on 1 January 2017, with an extension notice dated 21 December 2016.
February 7, 2017 Fuel Economy/ CO2 USA (Federal) Phase 2 standards for heavy duty vehicles were published in October 2016; their phase-in will start with model year 2018 or 2021, depending on the type of vehicle, and the final standards will apply from model year 2027
November 30, 2016 Emission Standards India Bharat Stage VI emissions standards have been published and will apply to all vehicles manufactured from 1 April 2020.
October 28, 2016 Emission Standards Mexico 1.The information of in-use limits and test procedures for gasoline vehicles was updated.
2. On 7 June 2016 the emergency official standard was published, which contains limits for pollutants and applies from 1 July 2016 for six months to all in-use vehicles in Mexico City and the several states.
October 20, 2016 Emission Standards EU 1. New real driving emissions (RDE) standards have been developed and will be implemented from 1 September 2017.
2. The draft implementing act to introduce new WLTP test for CO2 and fuel consumption test will be sent to the European Parliament and Council shortly for scrutiny. If the current text is endorsed, the new WLTP test will be mandatory for all new vehicle types from September 2017 and for all new vehicles from September 2018.