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Spain's cities are implementing Low Emission Zones (ZBEs) by 2023 to reduce air pollution. Drivers must acquire environmental labels for their vehicles, classified into four categories: Zero Emissions, ECO, B, and A.

Zero Emissions are for electric and hydrogen vehicles, while ECO includes certain hybrids. Vehicles not meeting these standards fall under group A and face restrictions. Stickers can be obtained at local Correos offices or other DGT locations with vehicle registration and ID.