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So the two alternatives to ULEZ you put forward don't have the effect of reducing pollution.
I proposed from the outset that vehicle pollution in the UK was already on the right curve, with a rapid move to zero emission vehicles. But this has to take time, so that we do not build the infrastructure ahead of the technology curve. In the UK we do not have a pollution problem on the same scale as the rest of Europe. That has nothing to do with our policies, but everything to do with our weather. South-westerlies are prevalent, in late spring - early autumn and Northerlies are prevalent at other times. That means we get clean air from the Atlantic mostly. Khan's tax on motorist with older vehicles is because he wont have an excuse in 2-5 years and he needs the money. The data shows the expansion will do nothing to reduce pollution ahead of the curve we were already on.
This is his best way to tax people outside of London for living near London, people who cannot vote him out.
As I said earlier, today's pollution is coming from Africa, due to the series of cyclonics in the North Atlantic. Expanding ULEZ will have zero difference to air quality.