A Low Emission Zone (LEZ) is an area in a city where access is restricted for vehicles that do not meet specific emission standards. The goal of an LEZ is to improve air quality by reducing pollution from older, more polluting vehicles. Cities like London and Berlin have implemented LEZs to encourage the use of cleaner transportation options. Vehicles that do not comply with the emission standards may face fines or be prohibited from entering the zone. LEZs often promote the use of public transport, cycling, and walking, contributing to a healthier environment and reducing traffic congestion in urban areas.