Passive smoking

After six years of ignoring the smog and dirt that is Hong Kong (and telling people that I grew up in London in the 1970s when it was pretty similar) I have finally found myself admitting that, yes, HK is a terribly unhealthy place and spending more time outdoors doing exercise makes it less rather than more healthy. I am even wondering whether I should spend a silly amount of money on an utterly pointless air purifier.

The cause of this?

Eve has had a horrid cough for the last two months and can't shake it.