Protesters are calling on Canterbury City Council to think again over its plans for a multi-storey car park in Station Road East.
The authority’s planning committee meets next week to decide the fate of the hugely controversial proposal to build the three-storey 374-space structure.
It says the car park will serve shoppers using St Dunstan’s Street and commuters travelling from the Canterbury West train station.
But opponents say the building will negatively affect the surrounding conservation area and is out of keeping with it.
However, the most strident opposition comes from campaigners who argue it will create more pollution by bringing cars into the area at a time when the council has committed itself to improving air quality.
Stephen Peckham, professor of health policy at the University of Kent, is among those leading the campaign to reduce pollution in Canterbury.
He said: “We are going to try to get the council to listen to us.
“The whole idea for the car park – which we are calling the carbuncle – is shot through with holes.
“Pollution levels in the area already exceed national limits and yet we’ve got something here that will bring more vehicles into it.
“The levels for the whole of the city are either stagnating or going up – that can’t continue.”
If approved, the car park would be built upon the council’s existing street level car park which is at the Sainsbury’s end of the road.
It would be ticketless with lengths of stays measured by an automatic number plate recognition (ANPR) system.
Supporters of the scheme say additional car parking spaces are needed in Canterbury.
The protest starts at 5,45pm on Tuesday, April 3 outside the Guildhall. The planning committee, which is recommended to approve the scheme, will begin its meeting at 6.30pm. It is open to the public.