cliveb
Head Pro
You need to answer because you are one of the chief protagonists in this thread, and your position is unambiguously one that supports ULEZ expansion on the grounds that it will improve air quality. I have presented some evidence that seems to suggest that air quality is just as good outside the ULEZ area, so I wanted to know how you reconcile this.Why do I "need" to answer? I'm not bringing in ulez or standing for election? I don't "need to do anything" to be honest ...
I also already have answered the question.
Improvements in cars by upgrading and new tech help improves air quality
Some changed naturally, some changed for ulez .
Also you need to look at traffic density
In a city more cars more pollution
In the country side less cars less pollution
Simple as that.
Thinking about it some more, I do have a theory that might explain your position.
Perhaps your argument is that ULEZ has encouraged people to change to less polluting cars (when without ULEZ they wouldn't have done so).
And this change has had a knock on effect so that those cleaner cars are also circulating in outer London, thus improving air quality there as well.
Does that about sum up your position? It's the only thing that makes sense to me.