Concerns surrounding Clean Air Zones (CAZs) are named in new research as two of the top three issues that car and van fleets believe they will face before 2026. Findings from Arval Mobility Observatory’s 2021 Barometer show that the top most common answers to the question, “What are the main challenges facing fleets in the next five years?”, were firstly the introduction of stricter CAZs (35%), followed by increased vehicle taxation (34%) and then the creation of more CAZs (30%).