Study Proves That Diesel Cars are Less Polluting than Petrol Cars
According to a new study that was conducted recently, modern diesel cars have improved and compared to the gasoline or petrol engine based cars, emit less pollution.
Earlier, Diesel engines came with a bad reputation because of the highly visible pollution. But, according to Patrick Hayes, Asst Professor, Universite de Montreal, Canada, it’s the invisible pollution from petrol engine cars that is more dangerous.
For the study, the researchers studied the particulate matter (PM) content that is emitted from the cars’ tailpipes.
Carbonaceous PM is primarily made up primary organic Aerosol(POA), black carbon and secondary organic aerosol(SOA), which contains harmful oxygen species that is reactive in nature and is responsible for damage to the lung tissue.
With advancements in the recent years, newer diesel cars are required to fit diesel particle filters(DPF) in cars that cause significant reduction on the pollution that is emitted.
It was noted that the gasoline based vehicles emitted on an average 10 times more carbonaceous PM, at 22°C and over 62 times at -7°C, as compared to a diesel car.
This increase in the emissions at low temperature has been related to a pronounced cold-start effect; i.e. when the petrol engine’s efficiency is low as it hasn’t warmed up yet, while the catalytic converter isn’t on yet.
The results challenge any current paradigms that associate diesel engine cars with higher PM emissions, and speak volumes about advancements such as DPFs as a mean to reduce pollution.
Although they did note that older diesel cars did pollute more because of lack of technologies like DPF.