Epping Forest MP Dame Eleanor Laing has added her name to a letter raising concerns over the proposed introduction of the London 'Ultra Low Emission Zone' up to the Epping Forest-London border.
London Labour Mayor Sadiq Khan is planning to bring in the extension from August 29.
Anyone who drives anywhere within the ULEZ, including the expanded area - and whose vehicle does not meet the emissions standards - could face a daily charge of £12.50.
Dame Eleanor is among MPs supporting a letter written to Conservative Party chairman Greg Hands MP by Ruislip, Northwood and Pinner MP David Simmonds.
The letter states: "We have great sympathy for all vehicle owners in London and the wider region who are facing the unfair imposition of the ULEZ charge at a time when many are concerned about the cost of living.
"As you will know... the Mayor's plans will affect vehicle-dependent individuals and damge small businesses."
The letter continues: "While hurting our constituents, the ULEZ expansion will have a negligible effect on air quality, according to the Mayor's own independent impact assessment.
"It is clear that a one-size fits-all approach is not the solution for tackling London's poor air quality. Giving London's boroughs greater power to reject the Major's proposals and to restore their responsibilities for air quality seems like a logical step to support our Conservative colleagues in local government."
