Compressed Natural Gas (CNG) buses are public transportation vehicles that run on natural gas, which is stored at high pressure. This fuel is cleaner than traditional diesel, producing fewer harmful emissions, making CNG buses an environmentally friendly option for cities. These buses are equipped with special tanks to hold the compressed gas, allowing them to travel long distances before needing to refuel. Many cities are adopting CNG buses to reduce air pollution and improve public health, contributing to a more sustainable urban transport system.