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For the purpose of improving air quality in the metropolitan area of Seoul, CNG buses were first introduced in July, 1997. By 2014, all Seoul buses were operating on CNG. Hyundai motor developed a CNG hybrid bus with 34.5% more-fuel efficiency and 30% lower pollution compared to CNG buses. As a result, Seoul city government plans to change to CNG hybrid buses for 2,235 low-bed disabled-friendly CNG bus in Seoul.
the metropolitan area of Seoul