Its means corona virus did this thing best for London . Because due to corona virus no one is getting out no vehicle no smoke is out there so the air becomes fresh and that is why it is fallen up .
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cnbc.com 
https://www.cnbc.com/2020/04/24/coronavirus-lockdown-has-dramatically-improved-air-quality-in-london.html 
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Its means corona virus did this thing best for London . Because due to corona virus no one is getting out no vehicle no smoke is out there so the air becomes fresh and that is why it is fallen up .