Press Esc to close

'New diesel cars better for environment than petrol vehicles'

Press Trust of India, Toronto, Jul 15 2017, 14:08 IST
Modern diesel cars emit less pollution than vehicles fuelled by gasoline or petrol, a study suggests. Reuters Photo (Representational Image)

Modern diesel cars emit less pollution than vehicles fuelled by gasoline or petrol, a study suggests. Reuters Photo (Representational Image)

Modern diesel cars emit less pollution than vehicles fuelled by gasoline or petrol, a study suggests.

"Diesel has a bad reputation because you can see the pollution, but it is actually the invisible pollution that comes from petrol in cars that is worse," said Patrick Hayes, an assistant professor at Universite de Montreal in Canada.

Researchers looked at carbonaceous particulate matter (PM) emitted from the tailpipes of cars.

Carbonaceous PM is made up of black carbon, primary organic aerosol (POA) and, especially, secondary organic aerosol (SOA), which is known to contain harmful reactive oxygen species and can damage lung tissue.

In recent years, newer diesel cars in Europe and North America have been required to be equipped with diesel particle filters (DPFs), which significantly cut down on the pollution they emit, researchers said.

They noted that gasoline cars emitted on average 10 times more carbonaceous PM at 22 degrees Celsius and 62 times more at minus seven degrees Celsius compared to diesel cars.

The increase in emissions at lower temperatures is related to a more pronounced cold-start effect, when a petrol engine is less efficient because it is not yet warmed up and its catalytic converter is not yet on, they said.

"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," researchers wrote in the journal Scientific Reports.

"It is true that older diesel cars do pollute more than petrol cars, because they do not have DPFs, and diesel cars in general emit far more nitrogen oxides, which cause smog and acid rain, they noted.

Go to Top

More from this section
Most trending stories
Photo Gallery
Two peacocks in a mid-flight at the Rastrapati Bhawan in New Delhi...

Two peacocks in a mid-flight at the Rastrapati Bhawan in New Delhi...

Former Telecom Minister A Raja addresses the gathering at his book launch 'The 2G Saga...

Former Telecom Minister A Raja addresses the gathering at his book launch 'The 2G Saga...

Police personnel stand guard near the premises of Mahabodhi Temple in Bodh Gaya...

Police personnel stand guard near the premises of Mahabodhi Temple in Bodh Gaya...

STF personnel recover gold after a raid which resulted in arrest of most wanted criminal Subodh...

STF personnel recover gold after a raid which resulted in arrest of most wanted criminal Subodh...

Former Miss Earth Nicole Faria addresses the event for felicitation of 112 women achievers...

Former Miss Earth Nicole Faria addresses the event for felicitation of 112 women achievers...

Bollywood actor Aishwarya Rai at an event to recognise 112 women achievers, to be honoured...

Bollywood actor Aishwarya Rai at an event to recognise 112 women achievers, to be honoured...

A farmer burns the residue of her sugarcane crop at her farm on a cold foggy morning...

A farmer burns the residue of her sugarcane crop at her farm on a cold foggy morning...

Kite-enthusiasts display a kite with an image of Kulbhushan Jadhav during International Kite...

Kite-enthusiasts display a kite with an image of Kulbhushan Jadhav during International Kite...

Honey bees visit a flower near Vijay Chowk area in New Delhi...

Honey bees visit a flower near Vijay Chowk area in New Delhi...

A squirrel eats corn grains on a cold winter morning in Bhopal ...

A squirrel eats corn grains on a cold winter morning in Bhopal ...

Like us on Facebook

Copyright 2017, The Printers (Mysore) Private Ltd., 75, M.G Road, Post Box 5331, Bengaluru - 560001
Tel: +91 (80) 25880000 Fax No. +91 (80) 25880523
Powered by Yodasoft Technologies Pvt. Ltd.