I've noticed when I leave London my asthma generally seems to get better. Unfortunately I live in London. The places it's been better includes some pretty polluted places & other big cities, for instance:
New York (November)
Mumbai, India (Feb - March, and Pune also in the monsoon)
Cambridge (all year)
Does anyone have any ideas whether there is some particular London factor involved?
Or maybe there isn't a particular London factor and it's just my house that's the problem...