Gas boilers now biggest source of air pollution in central London, study shows

The reduction in road vehicle pollution since ULEZ was introduced in central London has a side effect: it’s easier to identify where the rest of London’s pollution is coming from.
Until recently, road pollution was so high that it effectively drowned out all the other sources of pollution in London’s air, but a bit like the tide going out, it’s much easier to see what’s left behind when you remove the road vehicles.
A new study by the University of York has revealed