I’m as much to blame as anyone. Right back in 1998 I got my hands on one of the first super-punchy Mk4 Volkswagen Golf diesels. That thing was a riot: an ordinary hatchback that had huge in-gear pace and seriously impressive fuel economy. And sometimes both at the same time.

I well remember a Boxing Day trip to Wymondham in Norfolk, up a deserted A11. The road was punctuated by roundabouts, the hyper-diesel’s favourite territory. Three-up, I was being trailed by a chap in an original Audi S4 Avant, which was no mean performer back then.

Volkswagen in emissions cheating scandal

However, the hyper-Golf left the stumbling Audi for dead at every roundabout exit, where the VW’s mid-range punch was almost comical. This was clearly the future: a compact, light, hatchback with serious pace and high 40mpg economy.

Six years later I was scrabbling around in the gutters of Piccadilly, central London. I was photographing the kerb stones which appeared to be thickly coated in a graphite-like substance. It was, in fact, the particulates being emitted - mainly - by London’s ageing diesel bus fleet.

What I couldn't see - although those with sensitive chests might have felt - was the nasty nitrogen oxides also being emitted by the diesel engines.

In 1994, the newly-formed Transport for London had introduced the infamous ‘Congestion Charge’, basing it on the level of CO2 emissions from vehicles. And in the global warming panic, the strict meanings of CO2 ‘emissions’ and ‘pollution’ had been dangerously - possibly deliberately - welded into one.

High-CO2 vehicles were ‘polluting’. Reducing CO2 ‘emissions’ had to be a national and local priority. In fact, as I pointed out on many internet forums, replacing London’s 24,000 black cabs with 24,000 petrol Range Rovers would massively improve central London’s air quality.

Living on a busy road in the capital, I had come to realise that the layers of fine dirt and dust on the front door and on the window sills was not just the backwash of living in city, it was mostly particulates, fired from the exhausts of vans, trucks, taxis and many older cars.

It has taken a ridiculously long time for law makers, civil servants and the media to wake up to the threat from diesel engines that are used in stop-start conditions.

Scientific studies showing London’s Oxford Street, and roads in central Oxford, Manchester and Birmingham were among the most polluted in the world seem to be published to no effect.

Certainly, the amount of pollution put out by diesel engines has fallen dramatically in the last few years, but there are plenty of scientists who are concerned that the newest engines are emitting ever smaller particulates, which, ironically, are so small they might get lodged deep in the lungs and even pass into the bloodstream.

Anything from regular stop-start traffic to speed bumps can, for example, cause peaks in nitrogen oxides emissions. The latest estimates are that there are 9500 premature deaths in the capital alone from exposure to pollution.

Then’s there’s the mostly unexplored issue of what happens as diesel engines age and internal components - such as the injectors - wear out. We’ve all seen clouds of black smoke from those tatty 55-plate Mondeos and Astras. And that’s not even considering the damage being done by the huge numbers of hard-driven and high-mileage commercial vehicles.