Environmental aspectWhen people come to Seoul, they might be impressed by the cleanliness of the city. This is due to the government's efforts in environmental and ecological protection. Improving air quality Since the mid-1990s, Seoul has taken actions to improve air quality. About 99% of buses, or 7,464 in total, use condensed natural gas. To reduce dust, water-based street cleaning is carried out. The machine can clean roads more than eight meters wide, as well as side streets and sidewalks in urban areas, can reduce the heat island effect and provide a cleaner urban area for citizens. Seoul has also worked hard on energy conservation. There is a nuclear power plant reduction program, to compensate for the energy generated by the nuclear power plant, people need to reduce energy consumption and increase the production of renewable resources. Therefore, solar and hydrogen energy are used in public transport and infrastructure. About 1,000 newly built schools and apartments use solar heaters. A quarter of energy in the new office building or...