Diesel cars produce twice the toxic emissions of buses and lorries

News at Six 6 January 2017

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Diesel cars are being unfairly targeted here. Instead of comparing diesel cars with diesel trucks and busses, they should be compared to petrol cars.


Apart from soot particles, diesel cars and trucks actually produce far less noxious emissions (carbon monoxide, hydrocarbons, nitrous oxides), than petrol emissions including nitrous oxides before it goes through the catalytic converter. The problem is that after going through a catalytic converter, petrol car emissions are somewhat lower.

As this video points out, this is a regulatory failure in testing which allows diesel car manufacturers to cheat the tests, rather than an inherent problem with diesel vehicles.

If diesel trucks and busses can be so clean, then so can diesel cars, and the appropriate testing and fuel quality regulations are introduced. Diesel fuel sulphur content can also be reduced to allow more effective catalytic converters, and nitrous oxide reducing additives can be included in diesel fuels.