Council leaders are set to approve plans which could lead to charging polluting vehicles to enter Bristol.
Pollution levels in some parts of the city are now double the recommended national limits.
Cabinet members will vote this afternoon on four options for clean air zones, with a final decision expected next year.
The council has launched a joint 'clean air zone' feasibly study with South Gloucestershire Council.
Once complete next year, the study will inform the action plan which could see the introduction of a London-style congestion zone.
The latest council report recommends that Bristol Mayor Marvin Rees approves the development of a clean air zone for Bristol and applies for additional funding to create an action plan.