A mum from Bristol has told ITV News she thinks the clean air zone will encourage more people to drive on roads outside the city centre.
Jo Chesterman's daughter Flo has asthma, a condition she believes is getting worse every day because of the traffic around her school.
Jo is part of 'St George Breathing Better' a resident action group trying to improve the air quality in their neighbourhood.
She says a CAZ will only push more drivers into St George.
Bristol City Council are considering two proposals. Option one is a clean air zone which charges for polluting buses, taxis and goods vehicles but not private cars.
Option two is a total diesel car ban, where all diesel vehicles would be banned from the city centre from 7am-3pm.
The city council is putting the two possible Clean Air Zone (CAZ) plan options up for consultation which the public will be able to voice their opinions on during a six-week consultation beginning on July 1.