Coronavirus lockdown has 'dramatically improved' air quality in London, mayor says

• In an attempt to tackle the coronavirus pandemic, strict rules have been in place in the U.K. since March. 
• Around the world, many cities have seen air quality improve since the introduction of lockdown measures.

A pigeon walks across a deserted Oxford Street in London, England, on March 28, 2020.

David Cliff | NurPhoto | Getty Images