Do diesels still pollute so much?
DECRYPTION – Recent advances in engines and filters have improved the fuel performance of diesel vehicles.
Crit’Air 4 and more vehicles, which can no longer circulate on weekdays in the low emission zone of Greater Paris, mainly include diesels registered before 2006. Twenty years ago, these polluted much more than gasoline. taking into account the emissions of nitrogen oxides (NOx) and fine particles.
“The energy cost to produce gasoline and diesel is roughly equivalent, it is at the level of the engine that the difference is played out, explains Gilles Corde, program manager at the Transport Results Center at the French Institute of Petroleum and New Energies (Ifpen). In gasoline engines, combustion takes place by a spark, while in diesel engines, combustion occurs by compression, a faster process that will produce more NOx and particles. For gasoline, systems to treat exhaust gases were implemented in the early 1990s, but doing the same for diesels was
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