Is London more polluted / dirtier than Hong Kong?

[Tricey]

Someone from the UK who now lives in Hong Kong said that London is a dirtier and more polluted city than Hong Kong. Since Hong Kong is one of the worst polluted places, I can't even imagine London being worse. Is it? Anyone lived in both?

My DH has lived in both and thinks that Hong Kong is much worse but as everything is air condtioned over there you often don't notice it..

: ) Hi Vic - We haven't been to London yet, but I really can't imagine it being more polluted than Hong Kong; and though the aircon helps to cut the humidity inside, the pollution is ever-present. The city has so much going for it otherwise, but the pollution is such a big problem.