Drivers from Swindon could be banned from entering parts of Bristol city centre if they drive a diesel car, following proposals by the city council to cut air pollution.
The council cabinet is due to debate the plans today.
Air quality in Bristol has long been a cause of concern, with high levels of nitrogen dioxide recorded in the city.
The Freight Transport Association has criticised the plan with a spokesman saying: "Announcing a proposed scheme with such little detail is unfair to the businesses and individuals who work tirelessly to keep the local economy afloat."
The ban zone will include part of the M32, the old city, Redcliffe, Spike Island, the Harbourside and part of Hotwells.
Under the proposal, which would come into effect in 2021, taxis will be charged £9 and HGVs £100 to enter the clean air zone between 7am and 3pm.