While up here, the institutions of the world are damned to find remedies to the smog to the sound of traffic blocks, there is a kind of gas chamber, where the particulate matter accumulates to levels that can get to be also much higher than those commonly detected in the surface.
That’s why the particulate emissions of Euro 6 diesel (but also Euro 4 and 5) are irrelevant
Cars pollute, but 50% of the particulate matter comes from heating and factory farms
The hell of a fine dust, according to a survey by the Financial Times entitled the London Underground, the dirtiest place in the city, is the set of metro stations. To corroborate his thesis, the centre for the study of the british newspaper has sifted through the metro in london retracing 75 sections within the tunnel of the Zone 1, the most central.
The paradox of the british
And has obtained data chilling. For example, the quality of the air in the carriages is ten times worse than limits set by the World Health Organization. And that, in some places, pollution from PM 2.5 recorded exceeded eight times the average you detect it normally on the streets.
But where does all this pollution? Mainly frombrake wear and, more in general, by the friction with the rails, and from the same dirt of the streets.
In essence, if we look at all this against the light with the announcement by Boris Johnson of the stop to the sale of the car with the engine from 2015, it is just the case to say that we are facing a great paradox.