Derby City Council has proposed three different options for Clean Air Zones within its consultation documents. Two of these proposed zones would be chargeable, with non-compliant vehicles being charged between £20 and £100. One option proposes charges within the inner ring road, whilst the other extends this to the outer ring road. The consultation closed on September 24th and discussions on the results are currently underway. The agreed upon zone is targeted to go live in early 2020.
Derby Council also maintains a CAZ FAQ page here with further useful details.