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I doubt it's really much about the 'environmental' angle. It's stimulated the car industry a little by creating some demand, but other than that, everything is business as usual.
The main motive the opponents seem to cite is fear of surveillance (all the while using their mobile phones extensively, the most effective surveillance tool invented so far). I have no idea if that angle was part of the desired effect if there is a ¢0NssssP1ℜazzzz¥.
I mean, I wouldn't be surprised if ULEZ was partly intended to distract people from the Silvertown Tunnel crap, or the lack of any progress on changing transport for the better quite generally, i.e. generate a lot of heat around something that doesn't actually do much to hurt your road-building agenda. I have no idea if there's any plan, though, it could just be genuine policy chaos.
Posted from my Silverfoil Tunnel.
There was this, too:
https://www.standard.co.uk/news/crime/blade-runners-ulez-sadiq-khan-accident-traffic-lights-cameras-orpington-b1133196.html
It's all the more astonishing as it's targeted at a mild, fairly ineffective measure that falls far short of what is required, but distorted beyond belief by a ridiculous media seeking to damage Khan.