Major cities worldwide are increasingly adopting Low-Emission Zones (LEZs) and Zero-Emission Zones (ZEZs) as essential tools to combat urban air pollution and traffic congestion. LEZs restrict high-polluting vehicles to improve local air quality by reducing pollutants like Nitrogen Oxide (NOx) and Particulate Matter (PM). On the other hand, ZEZs only allow vehicles with zero tailpipe emissions, such as battery electric vehicles (BEVs) and hydrogen fuel cell vehicles (FCEVs), aiming for urban decarbonization and climate neutrality. European cities have been pioneers in implementing LEZs and ZEZs, with London's Ultra Low Emission Zone (ULEZ) showcasing significant success in reducing NO2 concentrations. Global movements like the C40 Cities Climate Leadership Group are driving the establishment of zero-emission areas by 2030 in cities worldwide. Reports indicate tangible benefits, with reductions in NOx and PM2.5 emissions seen in cities like Paris, Barcelona, and Madrid. These initiatives demonstrate a global shift towards sustainable urban transportation and environmental policies.