Changzhi is a prefecture-level city in Shanxi Province, People's Republic of China. This historical city was one of the 36 administrative areas under rein of the first emperor of a unified China. Literally speaking, Changzhi means 'eternal peace' in Chinese.Nowadays, Changzhi is a transportation centre in Shanxi. Convenient transportations are facilitated by 4 controlled-access highways, 2 railways, 3 national highways and 1 airport(Changzhi Wangcun Airport, ITAT Code: CIH, ICAO Code: ZBCZ). Internal transportation is also built with bus and taxi network.Besides, the city is a rising commercial and industrial centre in south-eastern area of Shanxi. In 2011, its GDP increasing rate ranked the 1st out of 11 prefecture-level cities in the province.Local environment, especially Air Quality Index, is monitored by China's Ministry of Environmental Protection and city government. A record of daily air quality has been kept and published by local government. To read the data, just visit http://www.czshb.gov.cn or directly type http://188.8.131.52:85/cz/ribao/index.asp for details of daily or real-time air quality. Changzhi is still on her way to a beautiful modern city with satisfied air quality and lots of efforts should be made in the future. Data from the 6th National Population Census in 2010 reported the city was home for 3,334,564 residents.