Industrial air pollutants, such as organochlorines and heavy metals, are carried to the arctic on air currents from populated areas. Lichens are a dominant life form on the tundra, and they are particularly vulnerable to air pollution because they lack roots and get the majority of their resources from the air. Because of this, lichens have historically been used as air pollution indicators.
Hurst is a city in Tarrant County, Texas, United States. Hurst is one of the Mid-Cities between Fort Worth and Dallas. it is local a suburb of Fort Worth. The city was founded by William Letchworth Hurst. As of the 2010 census, it had a population of 37,337.
Originally called Tarrant County Junior College (TCJC), the school began on July 31, 1965 after voters approved a bond election for the formation of a junior college district. In 1967 the first campus, the South Campus, opened in south Fort Worth and soon after in 1968, the Northeast Campus was built in Hurst.