They are.
https://fearoflanding.com/demystifying/post-pandemic-mystery-at-heathrow/
> There was another, more obvious, change. Seismologists found that across the UK, there was a 50% reduction in vibrations during the pandemic lockdown and urban noise was reduced by 5 db (60% quieter). The airport, usually a significant source of noise and vibrations, would have been much more attractive to animals without the constant traffic.
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