Cool, now close London City Airport for some serious noise pollution reduction.
The real issue is that they put east-west airport runways due east/west of the centroid of population. It’s almost as if they wanted the airports to maximally affect as many Londoners as possible.
I mean, they can't be so bloody stupid to have put the biggest airport in Europe on the western outskirts of a city and then have made a major landing strip come in from the east.
To your point, airplanes coming in basically bathe the entire city east to west in noise.