WHOAH, Don't flog your older diesel car just yet!
I read an article recently on the BBC website and was shocked to learn that older Diesel cars could be far less polluting than brand new modern diesels!!
The article discusses the emissions testing of older cars and in particular explains how Nitrogen Oxide is the most dangerous type of emissions in built up areas.
Here's a quote..
“The average real-world [NOx] emissions from our Euro 6 diesels that we've tested is currently 0.399g/km. The (2009 diesel) Skoda tested is about a third less than the current average.”
I ask him if I've understood correctly. My dad's 2009 car emits less NOx than most new diesels they've tested in the past three years?
Yes, a third less, he says. So how come they are legal if the Skoda would not now pass the legal limit?
Here's the tricky bit. The limit on NOx for Euro 6 diesels is 0.08g/km. My dad's Skoda comes in at 0.262g/km.
In other words, more than three times today's limit. But it is still better than most modern diesels.
Here are two examples:
~ The Renault Megane Experience (1461cc) produces 0.991g/km - 12 times the limit (made in 2016, tested in January 2017)
~ The Fiat 500X CityLook Popstar (1598cc) produces 1.153g/km - 14 times the limit (made in 2015, tested in December 2015)
But the worst is the Nissan Qashqai, which last month overtook the Ford Fiesta to become the UK's most registered car (counting diesel and petrol models together).
The Qashqai N-Connecta DCI CVT (1598cc) produces 1.46g of NOx per kilometre. That is more than 18 times Europe's 0.08g/km limit.
So why are diesels managing to pass strict limits in the lab while producing high levels of emissions on the road?
It’s all down to the New European Driving Cycle - the laboratory process in place in Europe since 1997 - says Anup Bandivadekar, passenger vehicles director at the International Council on Clean Transportation.
This puts cars through a test involving steady acceleration, constant speed driving and steady deceleration. It bears no relation to how people actually drive, Bandivadekar says.
www.bbc.co.uk/news/resources/idt-sh/how_toxic_is_your_car_exhaust