DIESEL engines now cleaner for the environment than gas engines

Friday, July 21, 2017
By Paul Martin

by: Jhoanna Robinson
Friday, July 21, 2017

An international study that was published on Monday, July 17 in the journal Scientific Reports showed that modern diesel cars release fewer carbonaceous particulate matter (PM) into the air than vehicles which use gasoline engines. The study, which was conducted by researchers in Norway and Switzerland with the help from colleagues in France, Italy, and the United States, compared the carbonaceous PM emitted by vehicles that are powered by diesel engine with the carbonaceous PM released by gasoline-powered cars.

Carbonaceous PM comprises primary organic aerosol (POA), secondary organic aerosol (SOA), and black carbon, all of which can cause lung cancer.

Recently, newly-manufactured diesel vehicles in Europe and North America were mandated to have diesel particle filters (DPFs) installed in them.

According to the study that was conducted in the laboratory at the Paul Scherrer Institute near Zurich in Switzerland, “Gasoline cars emitted 10 times more carbonaceous PM at 22 degrees Celsius and 62 times more at -7 degrees Celsius compared to diesel cars. The increase in emissions at lower temperatures is related to a more pronounced cold-start effect.”

This refers to when a gasoline engine is not yet warmed up and its catalytic converter is not yet on.

“These results challenge the existing paradigm that diesel cars are associated, in general, with far higher PM emission rates, reflecting the effectiveness of engine add-ons like DPFs to stem pollution,” the study added.

Patrick Hayes, a chemist at the University of Montreal who worked on the study, said government regulators should look at shifting the blame on gasoline-powered vehicles as the source of pollution rather than cars that are powered by diesel engines.

The Rest…HERE

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