B ritain's first zero emissions street could be permanently reinstated after toxic air rose to illegal levels when an 18-month trial ended.Petrol and diesel vehicles were banned from using Beech Street, a road tunnel under the Barbican estate, as a through route from March 2020.But when the experiment ended in September 2021, nitrogen dioxide levels shot back up as did overall levels of traffic, though numbers had been suppressed by the pandemic.
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