European Emission Standards (Euro I to Euro VII)

1. Definition and Background

European emission standards are mandatory technical regulations established by the European Union (EU) governing harmful tailpipe emissions from newly produced light-duty vehicles (passenger cars and light commercial vehicles), designated by Arabic numerals (Euro 1 to Euro 7). Since the debut of the Euro 1 standard in 1992, the framework has slashed pollutant emissions by over 95% through progressively stricter limits, serving as a key benchmark for global automotive emissions regulations.

2. Implementation Timeline and Key Pollutant Limits

Emission Stage	New Model Type Approval Date	Key Technical Highlights & Limit Changes (Passenger Cars)
Euro 1	July 1992	Mandated three-way catalytic converters and unleaded petrol; CO limit set at 2.72 g/km, HC+NOx limit at 0.97 g/km.
Euro 2	January 1996	Introduced differentiated limits for petrol and diesel vehicles; direct-injection diesel HC+NOx limit capped at 0.9 g/km.
Euro 3	January 2000	Eliminated engine warm-up allowances from testing, introduced a standalone NOx limit (0.50 g/km), and lowered diesel PM limits to 0.05 g/km.
Euro 4	January 2005	Substantially tightened limits; diesel NOx reduced to 0.25 g/km and PM down to 0.025 g/km.
Euro 5	September 2009	Introduced Particle Number (PN) limits for the first time (6.0×10¹¹ #/km).
Euro 6	September 2014	Significantly slashed NOx limits (diesel at 0.08 g/km); introduced Real Driving Emissions (RDE) testing.

3. Core Highlights of the Euro 7 Standard

The Euro 7 standard (Regulation (EU) 2024/1257), which came into force in May 2024, is viewed as the "final frontier" for light-duty vehicle tailpipe emission limits, with key changes focused on the following areas:

Tailpipe limits aligned with Euro 6: Tailpipe emission limits have not been tightened further, but the PN exemption for port-injected petrol engines has been abolished, requiring all petrol vehicles to meet PN limits; additionally, the PN measurement threshold has been tightened from 23 nm down to 10 nm (PN10).
Inclusion of non-exhaust emissions under regulation: For the first time, emission limits are imposed on particulate matter (PM10) from brake pad wear, alongside mandatory limits for tyre abrasion mass loss.
Introduction of full lifecycle compliance: Vehicles must now comply with emission limits for up to 10 years or 200,000 km; mandatory fitment of On-Board Monitoring (OBM) systems and an Environmental Vehicle Passport (EVP) to enable real-time tracking and traceability of emissions data.

4. Implementation Timeline

29 November 2026: All Category M1 (passenger cars) and Category N1 (light commercial vehicles) applying for new vehicle type approval must comply with Euro 7 standards.
29 November 2027: All new M1 and N1 vehicles registered and sold across the EU market must be fully compliant with Euro 7 regulations.