Emission control systems in modern cars have slashed air pollutants such as particulate matter and nitrogen oxides.
But these systems face two major challenges: carmakers cheating on pollution tests and owner tampering. Cheating means high-polluting cars can be sold when they shouldn’t be, while tampering can increase some pollutants up to 100 times.
In our new research review, we found the impacts of cheating and tampering on emissions of pollutants are substantial across the globe. For instance, researchers in Spain found almost half the diesel trucks had been tampered with,…
