Which will target older, more polluting vehicles. in the past few years, more and more clean air zones have been introduced across the country, as you can see here on this map. scotland has one low emission zone too, and is planning more. clean air zones are graded from a to d with different vehicle types being liable for charges under each grade. daily entry charges for non compliant vehicles range from £7 for taxis in bradford, to £100 for lorries, buses and coaches in bristol. birmingham city council introduced its scheme in 2021. they say revenues generated in the zone are used to cover its operation, and any net surplus revenues must be re invested in local transport related policies. more than £53 million has already been allocated to projects in birmingham including a trial of hydrogen buses. but the cost of clean air schemes are proving to be quite divisive.