Air quality map of London
Outside the very centre of London, air quality is apparently improving somewhat - but clearly not along major transport routes. An extra reason to walk along back streets wherever possible.
https://londonair.org.uk/london/asp/AnnualMapsFullScreen.asp?species=NO2&LayerStrength=75
https://londonair.org.uk/london/asp/AnnualMapsFullScreen.asp?species=NO2&LayerStrength=75
