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.
Hurst is located in northeast Texas. Hurst is part of Tarrant County. Hurst has 9.91 square miles of land area and 0.01 square miles of water area. As of 2010, the total Hurst population is 37,337, which has grown 2.93% since 2000. The population growth rate is much lower than the state average rate of 20.59% and is much lower than the national average rate of 9.71%. Hurst median household income is $51,655 in 2008-2012 and has grown by 2.55% since 2000.