Levels in the city have fallen by 52% on the same period last year
Air pollution levels in Exeter have fallen significantly in the two weeks since the country went into lockdown.
Analysis by the BBC Shared Data Unit has found nitrogen dioxide (NO2) levels in the city have fallen by 52% on the same period last year.
The gas is released from an exhaust and seriously pollutes the air, while it also indirectly contributes to the warming of the planet.
Campaigners say they hope the fall across the UK will lead to a permanent change.
Speaking to the BBC, Jenny Bates, a Friends of the Earth clean air campaigner, said: "Seeing this drop in air pollution shows that less traffic can quickly lead to cleaner air.
She added: "Once this dreadful situation is over, we don't want to rush to go back to where we were or worse, and we can't have an accelerated return to business as usual.
"We can have a better, cleaner future for ourselves and the planet."
The full dataset from across the UK can be found here.
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