Pollutionwatch: exhaust emissions double below 20C – by design

Modern cars can start in the cold, so why are manufacturers failing to make exhaust controls more efficient below 20C?Twenty-five years ago, starting a car in winter required careful balancing of choke and accelerator and sometimes sprays of WD40 or a bump start. Now, modern vehicles simply work in the cold. However, a European parliament inquiry following the Volkswagen scandal found that the nitrogen oxides abatement systems on many diesel cars shut down below the official test temperature of