Friends of the Earth Scotland is urging people who don't have cars or choose to use public transport to vote in favour of congestion charging in Edinburgh's referendum to be held next spring.
The call follows last week's announcement that a public local inquiry into the city's road-toll plans approved the scheme and that Edinburgh council will run a promotional campaign encouraging everyone to vote.
"Some 46 per cent of Edinburgh households do not have access to a car, and many more individuals do not make daily use of a car," said Duncan McLaren, Friends of the Earth Scotland's chief executive. "Every one of those residents has just as much right to have their say on this proposal as those who choose to drive."
He said these citizens would benefit most through improved public transport provision if the referendum backed congestion charges.
Campaign materials will point to the effectiveness of the congestion charge in reducing traffic elsewhere, and explain that road tolls would reduce pollution and protect public health.
The messages will be disseminated online, as well as on posters and leaflets.