Car emissions: MEPs set end on gap between lab and real driving emission tests

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To ensure that cars meet EU limits on NOx emissions, tests under real driving conditions must be more stringent, said the Environment Committee on Tuesday.

  • MEPs set more stringent limits on portable equipment used to determine compliance with emission limits
  • Discrepancy between laboratory and real driving emission tests must end by 30 September 2022
  • Air pollution is the number one environmental cause of premature death in the EU

The Environment, Public Health and Food Safety Committee adopted on Tuesday an amendment to EU rules on measuring emissions from light passenger and commercial cars (Euro 5 and Euro 6) with 55 votes to 14 and 11 abstentions. MEPs want to substantially reduce NOx emissions to address the serious problems caused by air pollution.

According to the 2019 Air Quality Report by the European Environment Agency, air pollution led to more than half a million premature deaths in 2016 and is the number one environmental cause of premature death in the EU. As passenger cars produce 40% of total EU NOx emissions, they are a significant source of air pollution, especially in urban areas.

Real driving emissions tests

Previously, pollutants such as NOx emissions from cars and other vehicles were measured in a laboratory. The EU is the first region in the world to introduce real driving emissions (RDE) tests to measure such pollutants emitted by vehicles while driven on the road.

To address any uncertainties regarding technical measurement linked with the introduction of these Portable Emission Measurement Systems (PEMS), which measure emissions from engines while they are being used, the Commission introduced a so-called ‘conformity factor’.

The Environment Committee wants the conformity factor currently in place to be annually lowered, based on assessments by the Joint Research Centre. This downward revision starts already with lowering the conformity factor from 1.43 to 1.32. It will cease to apply by 30 September 2022, after which only the raw data from RDE tests will be used to determine compliance with EU emission limits, MEPs agreed.

The report also asks that the Commission establish by June 2021 more stringent requirements for the portable measuring equipment to be used for RDE tests.

Next steps

The report is expected to be on the agenda of the European Parliament’s September plenary session, after which negotiations can start with Council (representing EU member states).