While I agree with you, Skip, on the clear case for LHR expansion I don't think we should be glib about the noise issues. LHR is vastly worse on this issue than other London airports and this has to be faced. It is a difficult issue.
While Boris is being a bit apocalyptic in his comments I'm not sure we can accuse him of lying. An airport's noise impact is normally measured by the number of people who live within specific noise contours. I don't have the figures for CDG, but if we look at the LEQ57 noise contour for example Heathrow is 65 times worse than LGW and 192 times worse than STN. For higher levels of noise exposure LHR comes out even worse, ie 90 times LGW or 230 times STN at the LEQ60 noise level.
Again I'm not trying to argue against LHR expansion but we can't pretend this isn't a real problem.
(Source 2012 data at
https://www.gov.uk/government/public...ondon-airports)