Well have I got good news for you.
Firstly Clean Air Zones are a result of central government policy to - GASP - kill less people through air pollution. I know. It's mad but apparently Westminster want to stop us killing people through pollution. Selfish morons.
So, it's national government we need to change.
Secondly when if by some crazy scheme, Stockport left Greater Manchester, air pollution would still be an issue and we could just end up with a Stockport Clean Air Zone instead.
Does Marple really have that much pollution?
Both my wife and I have considerable problems with air pollution in some places (although not Marple). It can make us, and particularly my wife, quite ill. However, we are not so selfish that we want to penalise other people just for our convenience or for our health. That really would be absurd. We accept that we should suffer, even if it causes major health problems, so as not to cause restrictions for others. That's what normal people do.
Marple should secede from the legal fiction of Greater Manchester anyway, as we have nothing to do with Manchester and want nothing to do with the place.