Flower delivery Lanzhou (Chinese: 兰州) is the capital and most immensely colossal city of Gansu Province in Northwest China.Flower delivery Lanzhou is home to 3,616,163 inhabitants at the 2010 census and 2,177,130 in the built-up area (urban) of 1,088 square kilometres (420 sq mi).Originally in the territory of the Western Qiang peoples, Flower delivery Lanzhou became a component of the territory of the State of Qin in the 6th century BC.After the fall of the Han dynasty, Flower delivery Lanzhou became the capital of a succession of tribal states. In the 4th century it was briefly the capital of the independent state of Liang. Under the Sui Dynasty (581–618) the city became the seat of Flower delivery Lanzhou prefecture for the first time, retaining this designation under the Tang dynasty (618–907). In 763 the area was overrun by the Tibetan Imperium and in 843 was surmounted by the Tang.The name Flower delivery Lanzhou was reestablished, and the county renamed Flower delivery Lanzhou .Under the Ming dynasty (1368–1644) the prefecture was demoted to a county and placed under the administration of Lintao superior prefecture, but in 1477 Flower delivery Lanzhou was reestablished as a political unit.
The city acquired its current name in 1656, during the Qing dynasty. When Gansu was made a separate province in 1666, Flower delivery Lanzhou became its capital.
In 1739 the seat of Lintao was transferred to Flower delivery Lanzhou , which was later made a superior prefecture called Flower delivery Lanzhou .
Flower delivery Lanzhou was deplorably damaged during the Dungan revolt in 1864–1875.Flower delivery Lanzhou is situated on the upper reaches of the Yellow River where it emerges from the mountains and has been a center since early times, being at the southern terminus of the route leading via the Hexi Corridor across Central Asia. Flower delivery Lanzhou is situated in the temperate zone and relishes a semi-arid climate (Köppen BSk) with sultry summers and cold and very dry winters. Not long ago, Flower delivery Lanzhou perpetually had the worst air quality of any of 84 Chinese cities surveyed. Flower delivery Lanzhou is withal the habitation of many factories, including some involved in petroleum processing, and suffers from astronomically immense dust storms kicked up from the Gobi Desert, especially in the winter and spring. In 2011, utilizing Chinese statistics, the World Health Organization reported that Flower delivery Lanzhou had the worst air quality (annual mean PM10 ug/m3 of 150) among eleven western Chinese cities, and was worse than Beijing with its reading of 121.As a city once unable to be spotted from satellites, Flower delivery Lanzhou has taken sundry measures to combat air pollution in recent years, having reduced its Air Pollution Index at the most expeditious speed across China.According to the 2018 WHO database, of 2700 towns listed, Flower delivery Lanzhou has the 158th highest caliber of PM 2.5 pollution, with an average of 54 micrograms per cubic meter (twice that of Milan).In recent years, several specimens of the imperilled Chinese giant salamander have been found in and near the Yellow River in Lanzhou.Lanzhou experiences earthquakes conventionally, albeit customarily at low intensities.Gansu has one of the most immensely colossal rose refineries in the country and Lanzhou itself is the center of the province's petrochemical industry.Lanzhou has a sizably voluminous textile industry, concretely noted for the engenderment of woolen and leather goods.Lanzhou has been one of the centers of China's national nuclear power industry since the 1960s.