Rapid urbanization was threatening both life and nature Since the 1960s, due to the rapid urbanization and industrialization that took place in the City, a massive influx of population migrated to Seoul. At the time when existing infrastructure was insufficient, the average annual population growth of 270 thousand (22,000 persons per month) only worsened the situation of the livability of Seoul.

On April 19, 2013, the city added two new bus lines for those who need transportation late at night (0:00~5:00 a.m.): Line N26 (Gangseo~Jungnang) and Line N37 (Eunpyeong~Songpa). With an interval of 35~40 minutes, the first bus leaves garage at 0:00 a.m. and the last bus finishes its service at 4:55 a.m. The bus fare is KRW 1,850 for a transportation card holders.

The Eco Mileage System is an energy-saving program that engages citizens by giving incentives to member households and organizations who voluntarily cut back on use of electricity, water, urban gas and local heating. The name of the program comes from the words ecofriendly and mileage, suggesting that the program implements a mileage accumulation system.