From the introduction of Euro 6 in 2015 vehicles fitted with CAT, combines oxygen with carbon monoxide to form non-poisonous carbon dioxide (CO2) reducing the high concentrations in the exhaust manifold (typically 30,000 ppm or more) to low concentrations (typically below 1,000 ppm after the catalytic converter). Most cars are now also fitted with a PPF reducing the ppm to around half again. Personally I don’t think Euro 6(d) cars are that bad to be behind or near, however get around an older petrol or diesel it stinks and finds its way into the car even if all vent are closed..
I live in a town which isn’t exactly enjoying prosperity, we’ve consistently been amongst the poorest parts of the country for decades, since the mines closed. Therefore, whilst the latest cars aren’t horrendous, we will have a large number of cars that wouldn’t still be on the road in many places added to the numbers of those teenager ridden mopeds pouring thick clouds of burnt oil out behind them, just so they can hit 35mph. it can get somewhat unpleasant. In front of me in a queue to get to school the other morning there was me (MG ZS EV) then a mini (original small one, not the new ones), then a volvo estate (I think an 850 but couldn’t see numbers but it was a 56 plate – when it passed me going back again), in front of that was a big, old BMW which had been modified and was smoking away at stand still and in front of that was an ancient landrover, couldn’t tell you how old or what type as it was held together by months of cagged mud everywhere. Clearly a farmer who has maintained it for decades as the engine definitely sounded more tractor like than car like. I felt like I needed a filter in the front of the car so everything that passed through was cleaned.
I'm Autistic, if I say something you find offensive, please let me know, I can guarantee it was unintentional.
I'll try to give my honest opinion but am always open to learning.
Mark