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.
Austin County is a county in the U.S. state of Texas. As of the 2010 census, the population was 28,417. Its seat is Bellville. The county is named for Stephen F. Austin, who facilitated the Anglo American colonization of Texas and is known as the Father of Texas.. Austin County is included in the Houston-The Woodlands-Sugar Land, TX Metropolitan Statistical Area. Austin County is not to be confused with the city of Austin, the state capital city that lies in Travis County approximately 110 miles to the northwest.