quite how this will help I do not understand...
More 20mph speed limits in congested residential areas
If an area is congested that will change the average speed anyway, so the speed limit is irrelevant and reducing it will not help.
If not congested then surely all you do is keep the traffic in the area for longer - would that not increase pollution?!
the rest of the suggestions:
Re-designing speed bumps to stop cars speeding up and slowing down between them
Restrictions on engine idling during short stops such as outside schools and hospitals
More charging points for electric cars in residential areas
Placing the most commonly-used rooms in new houses away from polluting roads
Training drivers to be more fuel efficient by driving more smoothly
All the rest seem to be good suggestions - I like the fact that there is some lateral thinking in saying that house design could also help...
and speed bumps redesign would be good - and smoother driving, well that is very much what we would support...