
Flickr/David Holt, E.G.-CC-BY-2.0
Despite publicised efforts to the contrary, air pollution in London has been bad and well above EU guidelines for a very long time. If others have not noticed this threat to health, it has not been lost on asthma suffers (for full disclosure of a special interest; I admit to this affliction).
A recent study estimates that over 9000 people die each year from air-pollution related health conditions, no small proportion of whom suffer from the various forms of asthma. By way of comparison: London traffic fatalities in recent years have run at an annual figure of less than 200; deaths due to murder fell below 100 in 2014; and the total for all infectious diseases was less than 3000 for the UK as a whole (the morbidity curious can go to the detailed listing).