Plug-in hybrids pollute six times more than their official ratings say: New EU data
New EU data shows plug-in hybrids emit six times what official lab tests claim, and the gap is widening year over year.
The gap between how clean plug-in hybrids are supposed to be and how clean they actually are just got wider.
New 2024 European Environment Agency data, drawn from real-world fuel-monitor readings on 220,000 vehicles, shows plug-in hybrids (PHEVs) registered that year averaged 145g of CO2 per kilometer on the road — versus just 24g in official lab tests. That's a sixfold gap, up from fivefold the year before. Real-world emissions actually rose 5% year-over-year even as official test results improved by 15%, meaning the cars aren't getting cleaner so much as the tests are getting more disconnected from reality.
At those real-world numbers, PHEVs — 9.8% of all EU car sales — cut emissions by just 14% compared to a standard combustion car, down from a 17% advantage previously. Transport & Environment's Lucien Mathieu didn't mince words: "Plug-in hybrids are one of the auto industry's greatest greenwashing stunts... yet delivering a heavy environmental toll in practice."
The auto industry, through trade group ACEA, is now lobbying to cancel a planned 2027 rule that would update the official "utility factor" used to calculate PHEV ratings, aligning them closer to real driving behavior. The EU Council is set to debate revised CO2 standards on October 12, with a parliamentary vote expected in November.
Analysis by Transport & Environment, via [CleanTechnica](https://cleantechnica.com/2026/09/07/plug-in-hybrids-emit-6-times-on-average-what-official-tests-claim-new-eu-data/). Translated and adapted with attribution.
This article was produced with the assistance of AI tools and reviewed by an editor before publication.
