Original sentence: However, the newly elected Mayor of London Boris Johnson announced that he will reform the congestion charge, particularly the plan to introduce the higher charge for the higher CO2 emission rate vehicles, by October 2008; also he wants to re-examine and run a new consultation about the 2007 western expansion of the congestion charge zone; and he wants to facilitate the payment of the charge by allowing it on a monthly basis.While vehicles with the very lowest CO2 emission rates will be exempted, those with higher rates will pay the new higher charge of , with the rest paying the £8 that they pay today
Edited sentence: However, the newly elected Mayor of London Boris Johnson announced that he will reform the congestion charge, particularly the plan to introduce the charge for the heavy-polluting vehicles by October 2008; also he wants to re-examine and run a new consultation about the 2007 western expansion of the congestion charge zone; and he wants to facilitate the payment of the charge by allowing it on a monthly basis.While some environmentally friendly vehicles will be exempted, more heavy polluters will pay higher charges, up to  from £8 they pay today